Food Chains and Ecosystems MCQs

1. What is the correct sequence in a typical food chain?
(A) Producer → Consumer → Decomposer
(B) Consumer → Decomposer → Producer
(C) Decomposer → Producer → Consumer
(D) Consumer → Producer → Decomposer

2. Which organism is always at the beginning of a food chain?
(A) Herbivore
(B) Carnivore
(C) Producer
(D) Omnivore

3. In an ecosystem, what is the primary source of energy?
(A) Water
(B) Soil
(C) Sunlight
(D) Air

4. Which of the following is a decomposer?
(A) Grass
(B) Earthworm
(C) Mushroom
(D) Goat

5. Which level in a food chain contains herbivores?
(A) First trophic level
(B) Second trophic level
(C) Third trophic level
(D) Last trophic level

6. What happens to energy as it moves up the food chain?
(A) It increases
(B) It remains constant
(C) It decreases
(D) It recycles completely

7. What type of consumer is a frog in a food chain that starts with grass?
(A) Primary consumer
(B) Secondary consumer
(C) Producer
(D) Decomposer

8. Which of the following is a biotic component of an ecosystem?
(A) Water
(B) Sunlight
(C) Soil
(D) Bacteria

9. What is the role of carnivores in a food chain?
(A) Decompose organic matter
(B) Consume producers
(C) Eat herbivores
(D) Fix nitrogen

10. Which of the following best describes an ecosystem?
(A) A group of the same species living together
(B) All living organisms only
(C) All living and non-living things interacting in an environment
(D) A place where only plants grow