Natural Ecosystems and Their Components MCQs

1. Which of the following is NOT a component of a natural ecosystem?
(A) Producers
(B) Consumers
(C) Decomposers
(D) Artificial structures

2. In a food chain, what role do producers play?
(A) They consume herbivores.
(B) They break down organic matter.
(C) They convert solar energy into chemical energy.
(D) They act as predators.

3. What is the primary function of decomposers in an ecosystem?
(A) To produce food for consumers
(B) To break down dead organic matter and recycle nutrients
(C) To prey on primary consumers
(D) To regulate the population of producers

4. Which of the following best describes a food web?
(A) A simple, linear sequence of energy flow
(B) A network of interconnected food chains
(C) A list of primary producers
(D) A single chain of predator-prey relationships

5. Which component of an ecosystem is responsible for the production of organic compounds from sunlight?
(A) Herbivores
(B) Carnivores
(C) Producers
(D) Detritivores

6. Which of the following is an example of an abiotic component in an ecosystem?
(A) Plants
(B) Animals
(C) Soil
(D) Bacteria

7. In a natural ecosystem, which organisms are known as the primary consumers?
(A) Herbivores
(B) Carnivores
(C) Decomposers
(D) Producers

8. Which of the following cycles is involved in the movement of water through an ecosystem?
(A) Nitrogen cycle
(B) Carbon cycle
(C) Water cycle
(D) Phosphorus cycle

9. What is the ultimate source of energy for most ecosystems?
(A) Water
(B) Soil
(C) Sunlight
(D) Air

10. What role do carnivores play in a natural ecosystem?
(A) They break down dead organisms.
(B) They produce food for herbivores.
(C) They regulate the population of herbivores.
(D) They contribute to soil fertility.