CL03 EV08 ANIMALS & THEIR FOOD

by

Animals and Their Feeding Habits

The Hook (The Mystery & Discovery)

A. Did you know that a single giant elephant can consume up to 270 kg of grass and leaves in a single day, spending a massive 15 to 16 hours of its daily life doing nothing but eating? B. Imagine if your front teeth were so large, sharp, and hard in both your upper and lower jaws that you had to feed by constantly gnawing and cutting through tough nuts and seeds, just like squirrels, rats, and rabbits do to survive! C. Did you know that some animals live in a world of limited colors? Butterflies possess a unique visual spectrum that only allows them to see violet, blue, green, and red colours as they search for nectar. D. Imagine if you could swallow your entire meal completely whole without chewing it even once, a survival method used by snakes and crocodiles, or if you had a long, sticky tongue that you could dart out to catch insects in a fraction of a second, just like frogs and lizards! E. Did you know that nature has its own highly efficient waste-management squad? Scavengers like jackals and hyenas eat the flesh of already dead animals, performing the vital ecological service of keeping our entire surroundings clean and free from disease. F. Imagine if you swallowed your dinner instantly without chewing it, only to bring it back up into your mouth hours later to chew it continuously while resting! This remarkable biological process is called chewing the cud, and it is how grazing domestic animals like cows, buffaloes, and goats process their food. G. Did you know that lions are the most powerful of all flesh-eating animals on Earth, living in organized, cooperative family groups called prides that consist of several females and their young ones?

Real-World Lesson (Why This Matters)

This chapter demonstrates that animal feeding habits are not random; they form a precise, interconnected biological engine that keeps our planet habitable and directly impacts modern human society.

First, the existence of scavengers (like hyenas, jackals, vultures, kites, and eagles) illustrates nature’s built-in sanitation system. In the real world, when an animal dies, its decaying remains can spread dangerous pathogens into the soil and water supply. By consuming these dead remains, scavengers prevent the outbreak of infectious diseases, acting as a natural shield for human communities and livestock.

Second, our reliance on domestic animals (such as cows, goats, sheep, buffaloes, and hens) forms the foundation of global agriculture, dairy production, and food security. The chapter highlights that because these animals serve us, humans have a direct responsibility to care for them by keeping their shelters clean every day, providing food and water in separate, clean vessels, and taking them to a veterinary doctor when they are sick. Neglecting domestic animal hygiene leads to zoonotic diseases that can jump from animals to humans, highlighting that animal welfare is directly tied to global public health.

Activities

  • The “Mouth-Parts Matchup” Experiential Lab: Set up stations with household tools representing different animal mouths:
    • Straws represent the long, pointed sucking tubes of butterflies, mosquitoes, and honeybees. Students try to suck water from a deep cup.
    • Pliers represent the sharp, hard gnawing teeth of rats and squirrels. Students try to crack open sunflower seeds.
    • Tweezers/Sticky Tape represent the long, sticky tongues of frogs and lizards. Students try to pick up paper-clip “insects” from a desk.
  • The “Chewing the Cud” Observation Log: Ask students to observe a cow, buffalo, or goat in their neighborhood or via a video clip. Students must time how long the animal chews without stopping, creating a scientific log that details the rhythmic grinding of the cud.
  • The Scavenger Hunt Environment Clean-Up Role Play: Scatter “decaying organic matter” (represented by crumpled brown paper) across the classroom. Assign students roles as scavengers (jackals, hyenas, vultures) and herbivores (zebras, goats). Only the scavengers can collect the brown paper, demonstrating to the class how these animals clean up the ecosystem.
  • The Veterinary Clinic Simulation: Set up a mock veterinary clinic in the classroom. Students take turns playing the role of farmers bringing in “sick” toy domestic animals (cows, horses, sheep) and veterinary doctors diagnosing them and prescribing clean shelters, fresh water, and separate, clean feeding vessels.

Diagrams & Maps

  1. Herbivore Dentition Chart (Flat teeth):
    • Visual: A drawing of a cow or horse skull.
    • Labels:
      • Flat front teeth: Used for biting and cutting grass and leaves.
      • Strong, flat grinding teeth at the back: Used for chewing and grinding plants thoroughly.
  2. Carnivore Dentition Chart (Pointed teeth):
    • Visual: A drawing of a lion or tiger skull.
    • Labels:
      • Long, pointed front teeth: Used to cut and tear flesh.
      • Strong grinding teeth at the back: Used to chew bones and flesh.
  3. The “Chewing the Cud” Digestive Flow Map:
    • Visual: A logical flowchart tracing the path of food in a ruminant (cow or goat).
    • Labels:
      • Phase 1: Grazing: Grass is bitten by flat front teeth.
      • Phase 2: Quick Swallow: Food is swallowed directly without chewing.
      • Phase 3: Regurgitation: Food is brought back from the stomach to the mouth.
      • Phase 4: Chewing the Cud: Food is chewed continuously for hours to ensure complete digestion.
  4. Specialized Feeding Organs Diagram Collection:
    • The Butterfly: Label showing the long, pointed tube used for sucking nectar.
    • The Frog: Label showing the long, sticky tongue catching an insect.
    • The Elephant: Labels showing the trunk performing three distinct functions: sucking up water, tearing branches from trees, and picking up food from the ground.
    • The Earthworm: Label showing the hole-like mouth taking in mud containing organic bits.

The Exhaustive Sequence / Process / Timeline

The biological classification of animals based on their feeding habits and the step-by-step physical processes of digestion proceed in a strict logical sequence:

I. Diet-Based Classification Sequence

  1. Herbivores (Plant-eating): Animals graze on plants, grass, fruits, and vegetables.
  2. Carnivores (Flesh-eating): Animals hunt live prey or feed on the flesh of other animals.
  3. Scavengers (Cleaners): Specialized flesh-eaters seek out already dead animals to consume.
  4. Omnivores (Mixed-diet): Animals consume a combination of plant materials and animal flesh.

II. The Process of Gnawing (Rats, Squirrels, Rabbits)

  1. The animal identifies a hard food item like a nut, seed, or fruit.
  2. It grips the food item using its specialized, very large, sharp, and hard front teeth located in both its upper and lower jaws.
  3. The animal bites the food repeatedly, cutting it into tiny, digestible pieces.

III. The Process of Chewing the Cud (Cows, Buffaloes, Goats)

  1. The animal bites grass from the ground.
  2. It swallows the grass immediately without performing any initial chewing.
  3. The unchewed food remains in the digestive system while the animal continues grazing.
  4. Later, when the animal is resting, it brings the swallowed food back up into its mouth.
  5. It uses its strong, flat grinding teeth to chew the food continuously for hours before swallowing it permanently.

IV. The Process of Insect Sucking (Mosquitoes, Butterflies, Honeybees)

  1. The insect lands on a liquid food source (flowers for nectar, or hosts for blood).
  2. It deploys its specialized mouthparts, which consist of a long, pointed tube.
  3. The tube penetrates the food source and sucks the liquid directly into the insect’s body.

V. The Process of Amphibian Sticky-Tongue Capture (Frogs, Lizards)

  1. The animal sits quietly and spots a target insect.
  2. It launches its long, sticky tongue out of its mouth toward the insect.
  3. The insect becomes stuck to the surface of the tongue on contact.
  4. The animal pulls its tongue back into its mouth, capturing and swallowing the insect.

VI. The Process of Mud-Feeding (Earthworms)

  1. The earthworm moves through the soil using its hole-like mouth.
  2. It swallows mud directly as it crawls.
  3. Its digestive system extracts tiny bits of dead animals and plants from the swallowed mud.
  4. The remaining clean mud is excreted back into the soil.

Comprehensive Vocabulary (The Word List)

  • Herbivores – Animals that eat only grass, plants, fruits, and vegetables – Used to describe plant-eating animals with flat front teeth and strong back grinding teeth.
  • Carnivores – Animals that eat the flesh of other animals – Used to classify predators like tigers, lions, foxes, and wolves that have sharp cutting teeth.
  • Scavengers – Animals that feed on the flesh of dead animals – Used to describe species like jackals and hyenas that perform environmental clean-up roles.
  • Omnivores – Animals that eat both plants and the flesh of other animals – Used to describe animals with a mixed diet, such as crows and bears.
  • Gnaw – To bite something repeatedly or chew it hard using sharp, hard teeth – Used to describe the biting and cutting feeding habits of rodents like rats, squirrels, and rabbits.
  • Chewing the Cud – The process of swallowing food quickly, bringing it back to the mouth later, and chewing it for hours – Used to explain the digestive routine of cows, buffaloes, and goats.
  • Prides – Social family groups in which lions live – Used to describe the group structures of lions, which consist of several females and their young ones.
  • Trunk – A long, flexible snout-like organ – Referenced as the multi-use tool of elephants used for drinking water, tearing tree branches, and picking up food.
  • Veterinary Doctor – A medical professional who specializes in treating sick or injured animals – Referenced as the healthcare provider required for sick domestic animals.
  • Domestic Animals – Animals raised by humans at home or on farms for help and resources – Used to classify cows, goats, sheep, buffaloes, and hens that depend on human care and protection.

Teacher’s Chapter Checklist

  • [ ] Dietary Identification: Can students define and differentiate between Herbivores, Carnivores, Omnivores, and Scavengers?
  • [ ] Herbivore Dental Adapation: Do students know that plant-eaters have flat front teeth and flat grinding back teeth?
  • [ ] Elephant Statistics: Can students recall that an elephant eats up to 270 kg of food daily and spends 15 to 16 hours eating?
  • [ ] Carnivore Dental Adaptation: Do students understand that flesh-eaters have long, pointed front teeth and grinding back teeth?
  • [ ] Flesh-Eating Birds: Can students list vultures, kites, and eagles as carnivores?
  • [ ] Social Predators: Do students know that lions live in family groups called prides?
  • [ ] Sanitation Heroes: Can students explain how scavengers like jackals and hyenas keep our environment clean?
  • [ ] Omnivore Identification: Can students list crows and bears as examples of omnivores?
  • [ ] Physical Determinants of Eating: Do students understand that feeding habits are determined by teeth, mouth shape, and jaw structure?
  • [ ] Gnawing Mechanics: Can students define gnawing and list rats, squirrels, and rabbits as gnawing animals?
  • [ ] Cud-Chewing Steps: Can students explain the complete process of chewing the cud in cows, buffaloes, and goats?
  • [ ] Insect Sucking Organs: Do students know that butterflies, bees, and mosquitoes use long, pointed tubes to suck food?
  • [ ] Butterfly Sensory Limits: Can students recall that butterflies can only see violet, blue, green, and red colours?
  • [ ] No-Chew Swallowing: Can students identify snakes and crocodiles as animals that swallow prey completely whole?
  • [ ] Sticky Tongue Capture: Can students explain how frogs and lizards capture insects with their tongues?
  • [ ] Elephant Trunk Functions: Can students list the three functions of an elephant’s trunk (suck water, tear branches, pick up food)?
  • [ ] Earthworm Ingestion: Do students know that earthworms eat mud containing dead organic matter through a hole-like mouth?
  • [ ] Domestic Care Guidelines: Can students outline the four rules of domestic animal care (shelter cleaning, separate clean vessels, veterinary visits, protection)?

Ready-Reckoner Student Revision Notes

1. Why Do Animals Need Food?

  • Survival: Every animal needs food to live.
  • Energy: Food gives animals the energy to move, work, and function.
  • Growth & Strength: It provides the nutrients needed to grow and stay strong.

2. Classification of Animals by Feeding Habits

  • Herbivores (Plant-eating Animals):
    • What they eat: Only grass, plants, fruits, and vegetables.
    • Teeth structure: Flat front teeth (for biting) and strong, flat grinding teeth at the back (for chewing).
    • Examples: Cows, buffaloes, goats, sheep, horses, zebras, elephants, and giraffes.
    • Elephant Fact: An elephant eats up to 270 kg of grass and leaves daily and spends 15 to 16 hours of its day eating.
  • Carnivores (Flesh-eating Animals):
    • What they eat: The flesh of other animals. They catch live prey or feed on dead animals.
    • Teeth structure: Long, pointed front teeth (for cutting and tearing flesh) and strong grinding teeth at the back (for chewing bones and meat).
    • Examples: Tigers, lions, foxes, and wolves.
    • Flesh-eating birds: Vultures, kites, and eagles.
    • Lion Fact: Lions are the most powerful flesh-eating animals. They live in groups called prides consisting of several females and their young ones.
  • Scavengers:
    • What they eat: The flesh of already dead animals.
    • Ecosystem Role: They keep our surroundings clean and hygienic.
    • Examples: Jackals and hyenas.
  • Omnivores (Plant- and Flesh-eating Animals):
    • What they eat: Both plants and the flesh of other animals.
    • Examples: Crows and bears.

3. Different Ways of Eating

An animal’s feeding habit depends on its teeth, its mouth and jaw shape, and the type of food it eats.

  • Gnawing:
    • Definition: Biting food repeatedly or chewing it hard.
    • Teeth: Very large, sharp, and hard front teeth in both jaws.
    • Examples: Rats, squirrels, and rabbits (used to eat nuts, seeds, and fruits).
  • Chewing the Cud:
    • How it works:
      1. Animals swallow their grass quickly without chewing it.
      2. Later, they bring the food back up from their stomach to their mouth.
      3. They chew the food continuously for hours to break it down.
    • Examples: Cows, buffaloes, and goats.
  • Sucking:
    • How it works: Using a long, pointed tube to draw in liquid food.
    • Examples: Mosquitoes, butterflies, and honeybees.
    • Butterfly Fact: Butterflies can only see violet, blue, green, and red colours.
  • Swallowing Whole:
    • How it works: Gulping down prey completely whole without chewing.
    • Examples: Crocodiles and snakes.
  • Sticky Tongue Capture:
    • How it works: Launching a long, sticky tongue to which insects adhere.
    • Examples: Frogs and lizards.

4. Unique Feeding Habits of Other Animals

  • Elephants: Use their trunk to suck up water, tear off tree branches, and pick up food from the ground.
  • Earthworms: Have a mouth that looks like a small hole and eat mud containing bits of dead plants and animals.

5. Rules for Caring for Domestic Animals

  • Definition: Animals that humans raise at home or on a farm because they are useful (e.g., cows, goats, sheep, buffaloes, hens, camels, horses).
  • Proper Care Guidelines:
    1. Provide food and water in separate, clean vessels.
    2. Clean their shelters every day.
    3. Treat them with care and protection.
    4. Take sick animals to a veterinary doctor immediately.

QUESTIONS :

Animals and Their Feeding Habits

1. The “Hidden” In-Text Questions (Mid-Chapter Extraction)

Q1. An adult elephant weighs several thousand kilograms. Explain why its eating habit of consuming up to 270 kg of plant material and spending 15 to 16 hours daily doing so is a biological necessity for its survival.

Q2. Lions are described in the text as social animals that live in groups called prides consisting of several females and their young ones. Why is cooperative group living an effective survival strategy for the world’s most powerful flesh-eating animals?

Q3. The text states that scavengers like jackals and hyenas eat the flesh of dead animals and help to keep our surroundings clean. Detail the environmental and public health crises that would arise if these scavenger populations were suddenly wiped out.

Q4. According to the introductory text on page 71, what are the three physical and biological determinants that dictate an animal’s specific way of eating?

Q5. Rodents like rats, squirrels, and rabbits have very large, sharp, and hard front teeth in both their upper and lower jaws. Why must these teeth be present in both jaws, and how does this dental layout enable the process of gnawing?

Q6. Grazing animals like cows and goats do not chew their food when they initially bite and ingest grass. Explain the biological advantage of this rapid-swallowing grazing behavior.

Q7. It is noted in the text that butterflies can see only violet, blue, green, and red colours. How does this specialized color vision serve as an evolutionary adaptation for their nectar-sucking feeding habits?

Q8. Describe how the physical mouth structure of an earthworm allows it to consume mud, and explain what specific nutrients its digestive system must extract from this soil.

Q9. Review the care guidelines for domestic animals provided in the text. Why does the chapter emphasize keeping animal shelters clean every day and providing food in separate, clean vessels?

2. The Textbook Exercise Integration (Back-of-Chapter)

Let’s Say (Give one word answer)

Q10. Who has long and pointed tube to suck blood?

Q11. Who has long and sticky tongue?

Q12. Who has sharp and broad front teeth?

Let’s Write

A. Tick the correct option

Q13. A lion is a: A) Flesh-eater B) Plant-eater C) Plant- and flesh-eater D) None of these

Q14. Which of the following is a plant-eating animal? A) Lion B) Tiger C) Elephant D) Hyena

Q15. Animals need food to get energy to: A) Grow B) Sleep C) Bath D) Awake

Q16. Which of the following is a gnawing animal? A) Horse B) Rat C) Dog D) Buffalo

B. Fill in the blanks using the words from the help box (scavengers, swallow, plant-eating, survive)

Q17. ____________ help to keep the surroundings clean.

Q18. Animals need food to ____________.

Q19. Cow is a ____________ animal.

Q20. Snakes ____________ their food.

C. Write ‘T’ for true and ‘F’ for false statements (If False, correct the statement)

Q21. An earthworm has a mouth that looks like a small hole.

Q22. A buffalo eats both plants and the flesh of other animals.

Q23. A vulture is a flesh-eating bird.

Q24. A snake sucks blood.

D. Match the columns

Q25. Match the items in Column A with the correct descriptions in Column B:

Column A Column B

  1. Gnawing teeth Giraffe
  2. Long neck Rabbit
  3. Trunk Earthworm
  4. Hole-like mouth Elephant
E. Answer the following questions

Q26. Define scavengers. Give two examples of scavengers.

Q27. How do animals depend on plants? What do you mean by ‘chewing the cud’?

Q28. What are plant- and flesh-eating animals? Give two examples of each.

Q29. Explain the feeding habits of frog and earthworm.

Mind Maze [HOTS]

Q30. How do jackal and vulture keep the environment clean?

Q31. What will happen if an animal is moved to an unfavourable habitat?

3. Exhaustive Objective Bank (The Factual Baseline)

Multiple-Choice Questions (MCQs)

Q32. According to the introductory text, why do all animals in the world need food?

A) To find companions B) To get energy, grow, and become strong C) To change their skin colors D) To hibernate through winter

Q33. Which of the following combinations of physical features determines how an animal eats?

A) Weight, height, and speed B) Teeth, shape of mouth, jaws, and type of food

C) Lifespan, fur density, and habitat D) Running style and tail length

Q34. What dental adaptation is found in plant-eating animals to help them chew grass and leaves?

A) Long pointed front fangs B) Flat front teeth and strong, flat grinding back teeth

C) Sharp, hook-like bills D) Small, razor-sharp serrated incisors

Q35. Which of the following groups consists strictly of plant-eating animals (herbivores)?

A) Cows, tigers, and foxes B) Sheep, zebras, and wolves

C) Goats, horses, and giraffes D) Elephants, bears, and jackals

Q36. How much food can an adult elephant consume daily according to the text?

A) Up to 100 kg of grass and leaves B) Up to 180 kg of grass and leaves

C) Up to 220 kg of grass and leaves D) Up to 270 kg of grass and leaves

Q37. What type of teeth do flesh-eating animals have to cut and chew meat and bones?

A) Large, flat front teeth and blunt back teeth B) Long pointed front teeth and strong back grinding teeth C) Small beak-like structures and no grinding teeth D) Thin, hollow tubes with zero back teeth

Q38. Which of the following birds are classified strictly as flesh-eating birds in the text?

A) Crows, sparrows, and parrots B) Vultures, kites, and eagles

C) Ducks, geese, and swans D) Owls, pigeons, and hens

Q39. What are animals called that feed on the flesh of already dead animals?

A) Herbivores B) Scavengers

C) Omnivores D) Ruminants

Q40. Which of the following pairs of animals are classified as scavengers in the textbook?

A) Tiger and Wolf B) Jackal and Hyena

C) Bear and Crow D) Rabbit and Squirrel

Q41. What is the correct definition of an omnivore based on the textbook?

A) An animal that eats only dead animal remains B) An animal that eats only grass, leaves, and fruits C) An animal that eats both plants and the flesh of other animals D) An insect that sucks liquids through long tubes

Q42. Which of the following are examples of omnivores?

A) Cows and horses B) Tigers and wolves

C) Crows and bears D) Jackals and hyenas

Q43. What is the physical feeding process called when an animal uses large, sharp, and hard front teeth in both jaws to bite and cut nuts, seeds, or fruits repeatedly?

A) Cud-chewing B) Sucking

C) Gnawing D) Swallowing

Q44. Which group of animals are classic examples of gnawing animals?

A) Cows, goats, and sheep B) Rats, squirrels, and rabbits

C) Frogs, lizards, and snakes D) Mosquitoes, butterflies, and bees

Q45. How do cows, buffaloes, and goats process grass when they first graze?

A) They chew it thoroughly for several hours B) They swallow it quickly without chewing

C) They crush it using their pointed front teeth D) They grind it into a paste before swallowing

Q46. Which of the following insects use a long, pointed tube to suck their liquid food?

A) Ants, beetles, and caterpillars B) Mosquitoes, butterflies, and honeybees

C) Earthworms, grasshoppers, and flies D) Spiders, crickets, and cockroaches

Q47. Based on the textbook, which of the following colors are within the visual spectrum of a butterfly?

A) Orange, yellow, and black B) Violet, blue, green, and red

C) Pink, purple, and gold D) Indigo, brown, and grey

Q48. Which animals do not chew their food but instead swallow their prey completely whole?

A) Crocodiles and snakes B) Rabbits and squirrels

C) Cows and goats D) Jackals and hyenas

Q49. How do frogs and lizards capture target insects from a distance?

A) They use sharp pointed claws B) They launch long, sticky tongues

C) They trap them in mud pools D) They suck them in through pointed tubes

Q50. How does an earthworm feed?

A) It uses a long, pointed tube to suck plant sap B) It bites plants with broad flat front teeth

C) It eats mud containing organic bits through a hole-like mouth D) It tears at the decaying flesh of dead insects

Q51. What is the mouth of an earthworm described as looking like?

A) A long pointed snout B) A hard beak

C) A small hole D) A pair of pincers

Q52. Which of the following are listed as domestic animals that humans raise at home or on farms?

A) Lions, tigers, and foxes B) Cows, goats, sheep, buffaloes, and hens

C) Squirrels, rabbits, and rats D) Crocodiles, snakes, and frogs

Q53. When domestic animals fall ill, where is it our duty to take them?

A) A local pet store B) A veterinary doctor

C) A forest reserve D) A wildlife sanctuary

Fill-in-the-Blanks

Q54. Food gives animals the ____________, helps them grow, and makes them strong.

Q55. Animals that eat only grass, plants, fruits, and vegetables are called ____________.

Q56. Plant-eating animals have flat front teeth and strong and flat ____________ teeth at the back.

Q57. An elephant spends about ____________ hours a day eating.

Q58. Animals that eat the flesh of other animals are called ____________.

Q59. Lions are the most powerful of all flesh-eating animals and live in groups called ____________.

Q60. Jackals and hyenas are classified as ____________ because they eat the flesh of dead animals.

Q61. Animals that eat both plants and the flesh of other animals are called ____________.

Q62. Rats, squirrels, and rabbits have very large, sharp, and hard front teeth in ____________ their upper and lower jaws.

Q63. Biting food repeatedly with very large, sharp, and hard front teeth is called ____________.

Q64. Ruminating animals like cows, buffaloes, and goats first swallow grass without ____________ it.

Q65. Some insects like mosquitoes, butterflies, and honeybees have ____________, pointed tubes for sucking.

Q66. Crocodiles and snakes do not chew their food; instead, they ____________ their prey whole.

Q67. Frogs and lizards have long, ____________ tongues to catch insects.

Q68. Sick domestic animals should be taken to a ____________ doctor.

True/False Questions

Q69. Plant-eating animals have long pointed front teeth and strong grinding back teeth. (If False, correct the statement)

Q70. Lions are social animals that live in family groups called prides consisting of several females and their young ones. (If False, correct the statement)

Q71. Scavengers keep the surroundings clean by hunting and killing live prey. (If False, correct the statement)

Q72. Crows and bears are plant-eating animals. (If False, correct the statement)

Q73. The feeding habits of animals depend on their teeth, the shape of their mouth and jaws, and the kind of food they eat. (If False, correct the statement)

Q74. Squirrels and rats swallow their food whole. (If False, correct the statement)

Q75. Butterflies can see all colors, including bright orange, yellow, and violet. (If False, correct the statement)

Q76. Snakes and crocodiles swallow their prey whole because they do not chew their food. (If False, correct the statement)

Q77. An elephant uses its long trunk to gnaw on hard nuts and seeds. (If False, correct the statement)

Q78. Domestic animal shelters should be cleaned every single day to ensure proper care. (If False, correct the statement)

4. Subjective & Competency Bank (Higher-Order Thinking)

Short-Answer Questions

Q79. Explain how the dental layout of a herbivore is structurally optimized for its specific diet of grass and leaves.

Q80. Why does the chapter describe scavengers like hyenas and jackals as essential for maintaining clean and healthy ecosystems?

Q81. Describe the structural design and multiple functions of an elephant’s trunk as outlined in the text.

Q82. Explain the mechanical process of gnawing and name three animals that possess the necessary dental layout to perform it.

Q83. Detail the complete sequence of events that occurs when a cow or goat undergoes the process of chewing the cud.

Q84. Explain how a butterfly’s mouthparts differ from those of a lion, and relate this difference to their respective diets.

Q85. Compare the insect-catching mechanism of a frog with the prey-ingestion mechanism of a snake.

Q86. Describe the physical shape of an earthworm’s mouth and explain how its feeding habits affect the soil.

Q87. Why must human caretakers provide domestic animals with food and water in separate, clean vessels?

Q88. Explain the human obligations associated with domestic animals when they become ill or require clean shelters.

Scenario-Based / Competency Questions

Q89. A farmer keeps his dairy cows in a damp, muddy barn that is cleaned only once a month, and feeds them from a shared dirty trough; identify three violations of the care guidelines in this scenario and explain the potential consequences.

Q90. If all frogs and lizards are completely removed from a local garden ecosystem, explain how this will impact the insect population in that area, citing their specific physical feeding adaptations.

Q91. A zookeeper notices a pet squirrel’s front teeth are growing excessively long and curved because it is only being fed soft cereal mush; explain why this soft diet is biologically inappropriate for a gnawing animal.

Q92. An ecologist notes that a wildlife sanctuary has seen a massive buildup of rotting animal carcasses on the forest floor; identify which animal group is missing from this ecosystem and explain their normal sanitary role.

Q93. A student places a synthetic yellow-orange flower in a butterfly enclosure and is surprised when the butterflies ignore it completely; explain how the butterfly’s sensory limitations as detailed in the text explain this behavior.

Long-Answer / Essay Questions

Q94. Provide an exhaustive, comparative classification of herbivores, carnivores, scavengers, and omnivores, outlining their definitions, specific dental adaptations, and multiple examples of each.

Q95. Explain the complete biological cycle of chewing the cud in ruminants, explaining how they bite, swallow, regurgitate, and grind their food, and discuss why this process is vital for digesting raw grass.

Q96. Detail the specialized, non-mammalian mouthparts and food-intake mechanisms mentioned in the chapter for butterflies, frogs, snakes, and earthworms, comparing how each organism takes in nutrients.

Q97. Write an essay on the responsibilities humans have toward domestic animals, detailing proper guidelines for shelter maintenance, separate clean vessels, veterinary care, and overall protection.

Q98. Explain how the physical characteristics of an animal—such as its teeth, mouth shape, and jaw structure—determine its specific feeding habits, using three highly distinct examples from the text.

5. The Master Answer Key & Marking Rubric

Mid-Chapter Extraction (Section 1 Answers)

  • Q1 Answer Rubric:
    • Keywords: 270 kg of grass/leaves, 15 to 16 hours daily, plant-eating / herbivore.
    • Points Required: Student must state that an elephant is a massive herbivore that eats grass and leaves. It requires a huge volume of food (up to 270 kg daily) to sustain its energy and body mass, which forces it to spend 15 to 16 hours a day eating.
    • Text Location: Page 70, Heading “Plant-eating Animals” (Fact Flash).
  • Q2 Answer Rubric:
    • Keywords: Social animals, prides, females, young ones, powerful flesh-eating animals.
    • Points Required: Student must explain that lions live in family groups called prides, composed of several females and their young ones. Living in prides allows for cooperative hunting, protection of the young, and defense of territory, making them highly effective apex predators.
    • Text Location: Page 71, Heading “Plant-eating and Flesh-eating Animals” (Fact Flash).
  • Q3 Answer Rubric:
    • Keywords: Scavengers, dead animals, clean surroundings, disease prevention.
    • Points Required: Student must define scavengers as animals that eat the flesh of dead animals. Without them, dead carcasses would accumulate on the landscape, rot, cause terrible odors, and spread diseases to other animals and humans, highlighting their role in keeping the surroundings clean.
    • Text Location: Page 71, Heading “Plant-eating and Flesh-eating Animals” (Fact Flash & Search).
  • Q4 Answer Rubric:
    • Keywords: Teeth, shape of mouth and jaws, kind of food they eat.
    • Points Required: Student must list: 1) Their teeth, 2) The shape of their mouth and jaws, and 3) The kind of food they eat.
    • Text Location: Page 71, Heading “Different Ways of Eating” (Fact Search).
  • Q5 Answer Rubric:
    • Keywords: Large, sharp, hard, both upper and lower jaws, cut nuts, seeds, or fruits.
    • Points Required: Student must explain that having these specialized teeth in both jaws allows the top and bottom teeth to press against each other with force. This allows rats, squirrels, and rabbits to bite hard foods repeatedly, cutting seeds, nuts, or fruits into tiny pieces (gnawing).
    • Text Location: Page 72, Heading “Gnawing”.
  • Q6 Answer Rubric:
    • Keywords: Swallow without chewing, chew the cud later, resting.
    • Points Required: Student must explain that swallowing grass quickly without initial chewing allows the animal to consume large amounts of forage quickly. Later, when resting safely away from threats, they can bring the food back up into their mouth to chew it for hours (chewing the cud).
    • Text Location: Page 72, Heading “Chewing the Cud”.
  • Q7 Answer Rubric:
    • Keywords: Violet, blue, green, red, nectar-sucking.
    • Points Required: Student must state that butterflies can only see violet, blue, green, and red colours. This specialized visual range is adapted to help them easily spot colorful, nectar-rich flowers in their surroundings.
    • Text Location: Page 73, Heading “Sucking” (Fact Flash).
  • Q8 Answer Rubric:
    • Keywords: Small hole, mud, bits of dead animals and plants.
    • Points Required: Student must describe the earthworm’s mouth as looking like a small hole. It feeds by swallowing mud directly as it crawls, and its digestive system extracts nutrition from the bits of dead animals and plants mixed within the mud.
    • Text Location: Page 73, Heading “Feeding Habits of Some Other Animals”.
  • Q9 Answer Rubric:
    • Keywords: Daily shelter cleaning, separate clean vessels, veterinary doctor, protection and care.
    • Points Required: Student must state that domestic animals serve us well only if we take proper care of them. Cleaning shelters daily prevents disease buildup, and separate clean vessels prevent contamination and spread of pathogens between animals.
    • Text Location: Page 74, Heading “Domestic Animals”.

Textbook Exercise Integration (Section 2 Answers)

Let’s Say
  • Q10: Mosquito, butterfly, or honeybee (Accept any insect from the text that sucks food).
  • Q11: Frog or lizard.
  • Q12: Plant-eating animals / Herbivores (such as cows, buffaloes, sheep, horses, zebras, elephants, giraffes).
Let’s Write
  • Q13: A) Flesh-eater
  • Q14: C) Elephant
  • Q15: A) Grow
  • Q16: B) Rat
  • Q17: Scavengers
  • Q18: survive
  • Q19: plant-eating
  • Q20: swallow
  • Q21: True.
  • Q22: False. (Correction: A buffalo is a plant-eating animal (herbivore) that eats only grass/plants, not other animals).
  • Q23: True.
  • Q24: False. (Correction: A snake do not suck blood; instead, it swallows its prey whole).
  • Q25:
    1. Gnawing teeth – (b) Rabbit
    2. Long neck – (a) Giraffe
    3. Trunk – (d) Elephant
    4. Hole-like mouth – (c) Earthworm.
  • Q26 Answer Rubric:
    • Keywords: Eat the flesh of dead animals, jackals, hyenas.
    • Answer: Animals that eat the flesh of dead animals are called scavengers. Examples include jackals and hyenas.
    • Text Location: Page 71, Heading “Plant-eating and Flesh-eating Animals”.
  • Q27 Answer Rubric:
    • Keywords: Food to survive, swallow grass quickly, bring back food, chew for hours.
    • Answer: Animals depend on plants directly for food (grass, plants, leaves, fruits, vegetables) to get energy, grow, and survive. ‘Chewing the cud’ is when animals like cows first swallow their grass without chewing; later, they bring this food back into their mouths and chew it for hours.
    • Text Location: Pages 70 & 72, Headings “Let’s Begin” and “Chewing the Cud”.
  • Q28 Answer Rubric:
    • Keywords: Omnivores, both plants and flesh of other animals, crows, bears.
    • Answer: Animals that eat both plants and the flesh of other animals are called omnivores. Examples include crows and bears.
    • Text Location: Page 71, Heading “Plant-eating and Flesh-eating Animals”.
  • Q29 Answer Rubric:
    • Keywords: Frog: long sticky tongue, catch insects. Earthworm: small hole mouth, mud containing dead bits.
    • Answer: Frogs have a long, sticky tongue to catch insects, which stick to their tongue. Earthworms have a mouth that looks like a small hole and eat mud containing bits of dead plants and animals.
    • Text Location: Pages 73, Headings “Swallowing” and “Feeding Habits of Some Other Animals”.
Mind Maze [HOTS]
  • Q30 Answer Rubric:
    • Keywords: Eat flesh of dead animals, clean surroundings.
    • Answer: Jackals and vultures are scavengers/flesh-eaters that consume the flesh of already dead animals. By eating these carcasses, they clear waste and help keep the environment clean.
    • Text Location: Pages 71, Heading “Plant-eating and Flesh-eating Animals”.
  • Q31 Answer Rubric:
    • Keywords: Unfavourable habitat, struggle to find food, teeth/mouth adaptions.
    • Answer: If moved to an unfavourable habitat, an animal will struggle to survive because its physical adaptations (teeth, mouth shape, jaws) are designed for a specific type of food. If that food is unavailable, it cannot feed properly and may die.
    • Text Location: Page 71, Heading “Different Ways of Eating”.

Objective Bank (Section 3 Answers)

  • Q32: B) To get energy, grow, and become strong
  • Q33: B) Teeth, shape of mouth, jaws, and type of food
  • Q34: B) Flat front teeth and strong, flat grinding back teeth
  • Q35: C) Goats, horses, and giraffes
  • Q36: D) Up to 270 kg of grass and leaves
  • Q37: B) Long pointed front teeth and strong back grinding teeth
  • Q38: B) Vultures, kites, and eagles
  • Q39: B) Scavengers
  • Q40: B) Jackal and Hyena
  • Q41: C) An animal that eats both plants and the flesh of other animals
  • Q42: C) Crows and bears
  • Q43: C) Gnawing
  • Q44: B) Rats, squirrels, and rabbits
  • Q45: B) They swallow it quickly without chewing
  • Q46: B) Mosquitoes, butterflies, and honeybees
  • Q47: B) Violet, blue, green, and red
  • Q48: A) Crocodiles and snakes
  • Q49: B) They launch long, sticky tongues
  • Q50: C) It eats mud containing organic bits through a hole-like mouth
  • Q51: C) A small hole
  • Q52: B) Cows, goats, sheep, buffaloes, and hens
  • Q53: B) A veterinary doctor
  • Q54: energy
  • Q55: herbivores (or plant-eating animals)
  • Q56: grinding
  • Q57: 15 to 16
  • Q58: carnivores (or flesh-eating animals)
  • Q59: prides
  • Q60: scavengers
  • Q61: omnivores
  • Q62: both
  • Q63: gnawing
  • Q64: chewing
  • Q65: long
  • Q66: swallow
  • Q67: sticky
  • Q68: veterinary
  • Q69: False. (Correction: Plant-eating animals have flat front teeth to bite grass, and strong flat grinding back teeth to chew it).
  • Q70: True.
  • Q71: False. (Correction: Scavengers eat the flesh of already dead animals to clean the environment).
  • Q72: False. (Correction: Crows and bears are omnivores that eat both plants and animal flesh).
  • Q73: True.
  • Q74: False. (Correction: Squirrels and rats feed by gnawing their food with very large, sharp, and hard front teeth).
  • Q75: False. (Correction: Butterflies can only see violet, blue, green, and red colours).
  • Q76: True.
  • Q77: False. (Correction: An elephant uses its trunk to suck up water, tear tree branches, and pick up food).
  • Q78: True.

Subjective & Competency Bank (Section 4 Answers)

Short-Answer Questions
  • Q79 Answer Rubric:
    • Keywords: Flat front teeth, biting, strong, flat grinding teeth at the back, chewing.
    • Marking Points: Explain that herbivores have flat front teeth specifically adapted for biting and cutting grass and leaves. They also have strong, flat grinding teeth at the back to thoroughly chew and grind tough plant fibers.
    • Text Location: Page 70, Heading “Plant-eating Animals”.
  • Q80 Answer Rubric:
    • Keywords: Flesh of dead animals, clean surroundings, scavengers.
    • Marking Points: State that scavengers eat the flesh of dead animals. By consuming rotting carcasses, they clean up biological waste, which keeps the surroundings hygienic and prevents disease spread.
    • Text Location: Page 71, Heading “Plant-eating and Flesh-eating Animals”.
  • Q81 Answer Rubric:
    • Keywords: Trunk, suck up water, tear off branches, pick up food from the ground.
    • Marking Points: List the three distinct trunk functions: 1) sucking up water, 2) reaching and tearing off branches from trees, and 3) picking up food from the ground.
    • Text Location: Page 73, Heading “Feeding Habits of Some Other Animals”.
  • Q82 Answer Rubric:
    • Keywords: Gnawing, very large, sharp, hard front teeth, both upper and lower jaws, repeatedly bite and cut.
    • Marking Points: Define gnawing as biting food repeatedly with sharp teeth to cut it. State that rats, squirrels, and rabbits have very large, sharp, and hard front teeth in both upper and lower jaws designed to cut hard seeds, nuts, or fruits.
    • Text Location: Page 72, Heading “Gnawing”.
  • Q83 Answer Rubric:
    • Keywords: Swallow without chewing, bring food back, chew for hours, cows/buffaloes/goats.
    • Marking Points: Explain that the animal first swallows grass without chewing it. Later, when resting, it brings the food back into its mouth and uses its back teeth to chew it for hours.
    • Text Location: Page 72, Heading “Chewing the Cud”.
  • Q84 Answer Rubric:
    • Keywords: Butterfly: long pointed tube, suck liquids. Lion: long pointed front teeth, strong back teeth, tear flesh.
    • Marking Points: Contrast the butterfly’s long, pointed sucking tube (used for drawing liquid nectar) with the lion’s long, pointed front teeth and back grinding teeth (used for tearing and chewing animal flesh and bone).
    • Text Location: Pages 70 & 73, Headings “Flesh-eating Animals” and “Sucking”.
  • Q85 Answer Rubric:
    • Keywords: Frog: long sticky tongue, catch insects. Snake: swallow prey whole, do not chew.
    • Marking Points: State that frogs use long, sticky tongues to catch insects which adhere to them. Snakes do not chew their food; instead, they capture prey and swallow it completely whole.
    • Text Location: Page 73, Heading “Swallowing”.
  • Q86 Answer Rubric:
    • Keywords: Small hole, eat mud, bits of dead plants and animals.
    • Marking Points: Describe the earthworm’s mouth as looking like a small hole. It feeds by ingesting mud containing bits of dead plants and animals, helping to turn over and process organic material in soil.
    • Text Location: Page 73, Heading “Feeding Habits of Some Other Animals”.
  • Q87 Answer Rubric:
    • Keywords: Separate, clean vessels, domestic animals, proper care, service.
    • Marking Points: Explain that providing feed and water in separate, clean vessels prevents food contamination, stops water from becoming fouled, and limits the transmission of diseases among domestic animals.
    • Text Location: Page 74, Heading “Domestic Animals”.
  • Q88 Answer Rubric:
    • Keywords: Clean shelters every day, protection and care, veterinary doctor.
    • Marking Points: State that human caretakers must clean animal shelters every day, provide care and protection, and immediately take sick animals to a veterinary doctor for medical treatment.
    • Text Location: Page 74, Heading “Domestic Animals”.
Scenario-Based / Competency Questions
  • Q89 Answer Rubric:
    • Keywords: Daily shelter cleaning, separate clean vessels, veterinary doctor.
    • Marking Points: Identify the three violations: 1) shelter is not cleaned every day, 2) food/water is not in separate vessels, and 3) the vessels are dirty. Consequence: The animals are highly likely to become sick and will not serve the farmer well.
    • Text Location: Page 74, Heading “Domestic Animals”.
  • Q90 Answer Rubric:
    • Keywords: Long, sticky tongues, catch insects, population multiply.
    • Marking Points: Explain that frogs and lizards use long, sticky tongues to catch insects. Removing them eliminates their natural predators, allowing the garden’s insect population to multiply rapidly without biological control.
    • Text Location: Page 73, Heading “Swallowing”.
  • Q91 Answer Rubric:
    • Keywords: Large, sharp, hard teeth, gnawing, cut seeds and nuts.
    • Marking Points: State that squirrels possess large, sharp, and hard front teeth in both jaws specialized for biting and cutting hard nuts, seeds, and fruits. A diet of soft cereal mush fails to wear down their teeth, which can cause overgrowth and prevent them from feeding properly.
    • Text Location: Page 72, Heading “Gnawing”.
  • Q92 Answer Rubric:
    • Keywords: Scavengers, jackals and hyenas, keep surroundings clean.
    • Marking Points: Identify that the missing group is scavengers (such as jackals and hyenas). Explain that their role is to eat the flesh of dead animals, keeping the forest clean.
    • Text Location: Page 71, Heading “Plant-eating and Flesh-eating Animals”.
  • Q93 Answer Rubric:
    • Keywords: Violet, blue, green, and red colours.
    • Marking Points: State that butterflies can only see violet, blue, green, and red colours. Because they cannot perceive orange or yellow in their visual spectrum, they may fail to recognize the fake orange flower as a feeding source.
    • Text Location: Page 73, Heading “Sucking” (Fact Flash).
Long-Answer / Essay Questions
  • Q94 Answer Rubric:
    • Marking Points: Define and detail all four groups:
      • Herbivores: Eat only plants/grass. Have flat front teeth and strong flat grinding back teeth. Examples: Cows, horses, giraffes, elephants.
      • Carnivores: Eat flesh of other animals. Have long pointed front teeth and strong back grinding teeth. Examples: Tigers, lions, wolves, vultures.
      • Scavengers: Eat flesh of already dead animals. Clean surroundings. Examples: Jackals, hyenas.
      • Omnivores: Eat both plants and flesh. Examples: Crows, bears.
    • Text Location: Pages 70-71, Headings “Plant-eating Animals”, “Flesh-eating Animals”, and “Plant-eating and Flesh-eating Animals”.
  • Q95 Answer Rubric:
    • Keywords: Swallow grass without chewing, regurgitation, mouth, grind for hours, flat grinding back teeth, cows/buffaloes/goats.
    • Marking Points: Break down the process:
      1. Biting and swallowing grass quickly without chewing it.
      2. Storing the unchewed food temporarily.
      3. Regurgitating (bringing food back from stomach to mouth) while resting.
      4. Chewing it continuously for hours using strong, flat grinding back teeth to break down plant matter.
    • Text Location: Pages 70 & 72, Headings “Plant-eating Animals” and “Chewing the Cud”.
  • Q96 Answer Rubric:
    • Keywords: Butterflies: long pointed sucking tubes. Frogs: long sticky tongues. Snakes: swallow prey whole. Earthworms: hole-like mouth, swallow mud.
    • Marking Points: Detail each mechanism:
      • Butterflies: Use long, pointed sucking tubes to suck nectar; have specialized color vision (violet, blue, green, red).
      • Frogs: Launch long, sticky tongues to catch target insects.
      • Snakes: Do not chew; swallow prey entirely whole.
      • Earthworms: Use a hole-like mouth to swallow soil/mud containing organic remains.
    • Text Location: Page 73, Headings “Sucking”, “Swallowing”, and “Feeding Habits of Some Other Animals”.
  • Q97 Answer Rubric:
    • Keywords: Clean shelters every day, separate clean vessels, protection and care, veterinary doctor, domestic animals.
    • Marking Points: Discuss human obligations to domestic animals (cows, goats, sheep, buffaloes, hens). Detail:
      1. Providing clean feed and water in separate, clean vessels daily to avoid contamination.
      2. Sweeping and cleaning shelters every single day to prevent disease.
      3. Providing adequate care and protection from threats.
      4. Taking sick animals to a veterinary doctor immediately for treatment.
    • Text Location: Page 74, Heading “Domestic Animals”.
  • Q98 Answer Rubric:
    • Keywords: Teeth, mouth shape, jaws, kind of food.
    • Marking Points: Explain that physical features dictate diet. Provide three distinct examples:
      • Example 1 (Gnawing): Rodents like rats have large, sharp, hard teeth in both jaws to cut hard nuts.
      • Example 2 (Sucking): Butterflies have long pointed sucking tubes to extract liquid nectar.
      • Example 3 (Tearing): Tigers have long pointed front teeth to tear flesh and strong back teeth to chew bones.
    • Text Location: Pages 70-73, Headings “Flesh-eating Animals”, “Different Ways of Eating”, “Gnawing”, and “Sucking”.

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