1. What is the primary role of producers in an ecosystem?
a) To break down dead organisms
b) To consume other organisms for energy
c) To produce food through photosynthesis
d) To absorb nutrients from the soil
Answer: c) To produce food through photosynthesis
2. Which of the following is an example of a producer?
a) Herbivores
b) Plants
c) Carnivores
d) Decomposers
Answer: b) Plants
3. Consumers in an ecosystem are also known as?
a) Autotrophs
b) Heterotrophs
c) Saprotrophs
d) Primary producers
Answer: b) Heterotrophs
4. Which of these is a characteristic of decomposers?
a) They produce their own food.
b) They consume plants directly.
c) They break down organic matter.
d) They are only found in aquatic ecosystems.
Answer: c) They break down organic matter.
5. Herbivores are an example of which type of consumer?
a) Primary consumers
b) Secondary consumers
c) Tertiary consumers
d) Decomposers
Answer: a) Primary consumers
6. Which of the following organisms is classified as a secondary consumer?
a) Grasshopper
b) Wolf
c) Deer
d) Owl
Answer: d) Owl
7. What type of organism consumes both plant and animal matter?
a) Herbivores
b) Omnivores
c) Carnivores
d) Producers
Answer: b) Omnivores
8. Decomposers include all the following except?
a) Bacteria
b) Fungi
c) Earthworms
d) Hawks
Answer: d) Hawks
9. In an ecosystem, which of the following represents a trophic level?
a) Water
b) Soil
c) Consumers
d) Climate
Answer: c) Consumers
10. Which of these is a characteristic of producers?
a) They rely on other organisms for food.
b) They only exist in terrestrial ecosystems.
c) They convert solar energy into chemical energy.
d) They decompose dead organic material.
Answer: c) They convert solar energy into chemical energy.
11. What type of organism is a lion in an ecosystem?
a) Producer
b) Primary consumer
c) Secondary consumer
d) Decomposer
Answer: c) Secondary consumer
12. Which of these is a main function of decomposers in an ecosystem?
a) Producing energy
b) Making food
c) Recycling nutrients
d) Consuming plants
Answer: c) Recycling nutrients
13. Which trophic level does a rabbit occupy in an ecosystem?
a) Producer
b) Primary consumer
c) Secondary consumer
d) Decomposer
Answer: b) Primary consumer
14. Producers are also known as?
a) Heterotrophs
b) Autotrophs
c) Consumers
d) Saprotrophs
Answer: b) Autotrophs
15. A food web is?
a) A linear sequence of energy flow
b) A diagram showing the feeding relationships in an ecosystem
c) Only about the flow of energy in a community
d) An illustration of one individual’s diet
Answer: b) A diagram showing the feeding relationships in an ecosystem
16. Which of the following is the correct sequence of energy flow in an ecosystem?
a) Producers → Primary consumers → Decomposers → Secondary consumers
b) Producers → Secondary consumers → Primary consumers → Decomposers
c) Producers → Primary consumers → Secondary consumers → Decomposers
d) Decomposers → Primary consumers → Producers → Secondary consumers
Answer: c) Producers → Primary consumers → Secondary consumers → Decomposers
17. An example of a decomposer is?
a) Cow
b) Fungus
c) Lion
d) Rabbit
Answer: b) Fungus
18. The process by which producers make food using sunlight is called?
a) Respiration
b) Photosynthesis
c) Digestion
d) Decomposition
Answer: b) Photosynthesis
19. Which of the following best describes primary consumers?
a) They eat producers.
b) They eat secondary consumers.
c) They decompose organic matter.
d) They make their own food.
Answer: a) They eat producers.
20. In an ecosystem, the primary source of energy is?
a) Soil
b) Water
c) Sunlight
d) Air
Answer: c) Sunlight
21. What would happen if decomposers were removed from an ecosystem?
a) Plants would start to grow faster.
b) Nutrients would not be recycled, leading to nutrient depletion.
c) Herbivores would become the primary producers.
d) Energy flow would stop.
Answer: b) Nutrients would not be recycled, leading to nutrient depletion.
22. What role do omnivores play in an ecosystem?
a) They only consume plants.
b) They only consume animals.
c) They consume both plants and animals.
d) They produce food for the ecosystem.
Answer: c) They consume both plants and animals.
23. Which of the following organisms would be a primary consumer in a grassland ecosystem?
a) Hawk
b) Deer
c) Grass
d) Wolf
Answer: b) Deer
24. In the energy pyramid, what happens to the amount of energy as it moves up the trophic levels?
a) It increases exponentially.
b) It stays the same.
c) It decreases.
d) It becomes unbalanced.
Answer: c) It decreases.
25. Decomposers break down organic material into simpler substances. Which of the following is a result of this process?
a) Production of oxygen
b) The creation of new plants
c) The recycling of nutrients
d) Increase in plant growth
Answer: c) The recycling of nutrients
26. What is an example of a tertiary consumer in a marine ecosystem?
a) Algae
b) Fish
c) Shark
d) Seal
Answer: c) Shark
27. Which of the following would be classified as a carnivore in a terrestrial ecosystem?
a) Bear
b) Rabbit
c) Deer
d) Lion
Answer: d) Lion
28. Which type of consumer is a fox in a food chain?
a) Primary consumer
b) Secondary consumer
c) Tertiary consumer
d) Decomposer
Answer: b) Secondary consumer
29. Which of the following organisms is the first in a food chain?
a) Secondary consumer
b) Producer
c) Decomposer
d) Herbivore
Answer: b) Producer
30. A lion is an example of which type of consumer in an ecosystem?
a) Primary consumer
b) Secondary consumer
c) Tertiary consumer
d) Decomposer
Answer: c) Tertiary consumer
These MCQs cover a range of topics related to producers, consumers, and decomposers, their roles in ecosystems, and their classification within food webs and energy flow.
