Environmental Scientist - TNPSC - Food Chain - MCQs

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Food Chain – MCQs


ANSWERS ARE GIVEN BELOW

1. In an ecological food chain, the organisms that produce their own food through photosynthesis are called:

A) Primary consumers

B) Producers

C) Decomposers

D) Secondary consumers


2. Which of the following represents the correct order of a grazing food chain?

A) Producer → Decomposer → Primary consumer

B) Producer → Primary consumer → Secondary consumer

C) Primary consumer → Producer → Secondary consumer

D) Decomposer → Producer → Primary consumer


3. The ultimate source of energy for most food chains on Earth is:

A) Soil

B) Water

C) The Sun

D) Green plants


4. In a food chain, herbivores are typically classified as:

A) Tertiary consumers

B) Producers

C) Secondary consumers

D) Primary consumers


5. Which of the following is an example of a detritus food chain?

A) Grass → Grasshopper → Frog → Snake

B) Dead leaves → Earthworms → Birds

C) Algae → Zooplankton → Fish

D) Plants → Cow → Human


6. What is the approximate energy transfer efficiency from one trophic level to the next in a food chain?

A) 50%

B) 100%

C) 10%

D) 1%


7. In a marine food chain, phytoplankton act as:

A) Decomposers

B) Primary producers

C) Secondary consumers

D) Tertiary consumers


8. Which of the following best explains why food chains rarely exceed 4–5 trophic levels?

A) Limited oxygen

B) Decreasing sunlight

C) Energy loss at each trophic level

D) Lack of biodiversity


9. Which organisms break down dead matter and recycle nutrients in an ecosystem?

A) Producers

B) Primary consumers

C) Decomposers

D) Carnivores


10. The ecological pyramid that cannot be inverted is the pyramid of:

A) Biomass

B) Numbers

C) Energy

D) Population



ANSWERS

1. In an ecological food chain, the organisms that produce their own food through photosynthesis are called:

A) Primary consumers

B) Producers

C) Decomposers

D) Secondary consumers

✅ Answer: B) Producers

2. Which of the following represents the correct order of a grazing food chain?

A) Producer → Decomposer → Primary consumer

B) Producer → Primary consumer → Secondary consumer

C) Primary consumer → Producer → Secondary consumer

D) Decomposer → Producer → Primary consumer

✅ Answer: B) Producer → Primary consumer → Secondary consumer

3. The ultimate source of energy for most food chains on Earth is:

A) Soil

B) Water

C) The Sun

D) Green plants

✅ Answer: C) The Sun

4. In a food chain, herbivores are typically classified as:

A) Tertiary consumers

B) Producers

C) Secondary consumers

D) Primary consumers

✅ Answer: D) Primary consumers

5. Which of the following is an example of a detritus food chain?

A) Grass → Grasshopper → Frog → Snake

B) Dead leaves → Earthworms → Birds

C) Algae → Zooplankton → Fish

D) Plants → Cow → Human

✅ Answer: B) Dead leaves → Earthworms → Birds

6. What is the approximate energy transfer efficiency from one trophic level to the next in a food chain?

A) 50%

B) 100%

C) 10%

D) 1%

✅ Answer: C) 10%

7. In a marine food chain, phytoplankton act as:

A) Decomposers

B) Primary producers

C) Secondary consumers

D) Tertiary consumers

✅ Answer: B) Primary producers

8. Which of the following best explains why food chains rarely exceed 4–5 trophic levels?

A) Limited oxygen

B) Decreasing sunlight

C) Energy loss at each trophic level

D) Lack of biodiversity

✅ Answer: C) Energy loss at each trophic level

9. Which organisms break down dead matter and recycle nutrients in an ecosystem?

A) Producers

B) Primary consumers

C) Decomposers

D) Carnivores

✅ Answer: C) Decomposers

10. The ecological pyramid that cannot be inverted is the pyramid of:

A) Biomass

B) Numbers

C) Energy

D) Population

✅ Answer: C) Energy

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