Nutrition in Animals and Plants (Class 7 Science)

Understand how plants and animals obtain and use nutrients. Learn about food chains, photosynthesis, and digestive systems.

Nutrition in Animals and Plants (Class 7 Science)

Understand how plants and animals obtain and use nutrients. Learn about food chains, photosynthesis, and digestive systems.

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TL;DR: Understand how plants and animals obtain and use nutrients. Learn about food chains, photosynthesis, and digestive systems.

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Understand how plants and animals obtain and use nutrients. Learn about food chains, photosynthesis, and digestive systems.

Nutrition in Animals and Plants MCQs with Answers & Explanations

Q1. What is nutrition?

  1. Drinking water
  2. Process of obtaining and utilizing food ✓ (correct)
  3. Physical exercise
  4. Gaining weight

Explanation: Nutrition is the process by which organisms obtain nutrients from food and utilize them for growth, energy, and maintenance of body functions.

Q2. What is the primary mode of nutrition in plants?

  1. Parasitic
  2. Holozoic
  3. Autotrophic ✓ (correct)
  4. Saprophytic

Explanation: Plants are autotrophic. They produce their own food through photosynthesis using sunlight, water, and CO2.

Q3. What is a food chain?

  1. Chain for storing food
  2. Food containers
  3. Chain of supermarkets
  4. Series of organisms where each is food for the next ✓ (correct)

Explanation: A food chain shows the flow of energy from one organism to the next: Producer → Primary Consumer → Secondary Consumer.

Q4. What is the role of producers in a food chain?

  1. Produce food using sunlight ✓ (correct)
  2. Consume energy
  3. Store energy
  4. Decompose organic matter

Explanation: Producers (usually plants) capture solar energy and convert it into chemical energy through photosynthesis, forming the base of food chains.

Q5. What is a herbivore?

  1. Animal that eats fungi
  2. Animal that eats plants ✓ (correct)
  3. Animal that eats meat
  4. Animal that eats both

Explanation: A herbivore is an animal that feeds exclusively on plants. Examples: cow, deer, grasshopper.

Q6. What are the main components of a balanced diet?

  1. Only vegetables
  2. Only proteins
  3. Carbohydrates, proteins, fats, vitamins, minerals, water ✓ (correct)
  4. Only fruits

Explanation: A balanced diet includes: carbohydrates (energy), proteins (growth/repair), fats (energy/insulation), vitamins and minerals (health), and water (hydration).

Q7. What is the function of saliva in digestion?

  1. Absorbs nutrients
  2. Stores food
  3. No function
  4. Lubricates food and begins breakdown of starch ✓ (correct)

Explanation: Saliva contains enzymes like amylase that begin breaking down starch. It also lubricates food for easier swallowing.

Q8. Which organ produces digestive enzymes called pepsin?

  1. Stomach ✓ (correct)
  2. Liver
  3. Pancreas
  4. Small intestine

Explanation: The stomach produces pepsin, a protease enzyme that breaks down proteins. The stomach lining also secretes hydrochloric acid.

Q9. Where is most nutrient absorption completed in the digestive system?

  1. Mouth
  2. Small intestine ✓ (correct)
  3. Large intestine
  4. Stomach

Explanation: Most nutrient absorption occurs in the small intestine. Its walls have villi and microvilli that increase surface area for absorption.

Q10. What is the function of bile in digestion?

  1. Digests carbohydrates
  2. Digests protein
  3. Emulsifies fats for better digestion ✓ (correct)
  4. Produces enzymes

Explanation: Bile, produced by the liver, emulsifies fats into smaller droplets, increasing surface area for fat-digesting enzymes in the small intestine.

Frequently Asked Questions

What is the difference between omnivores, herbivores, and carnivores?

Herbivores eat only plants (cow, rabbit). Carnivores eat only meat (lion, eagle). Omnivores eat both plants and meat (humans, bears, pigs).

How long does complete digestion take?

Complete digestion typically takes 24-72 hours. Food takes about 6 hours to pass through the small intestine and several hours more in the large intestine.

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