Questions on Food Chain
Multiple-Choice Questions: Food Chain
1. What is a food chain?
A) A sequence of organisms that share a habitat
B) A system of nutrient cycles
C) A group of organisms at the same trophic level
D) A linear sequence of energy transfer through organisms
E) A list of species in an ecosystem
2. The first link in any food chain is usually:
A) A carnivore
B) A decomposer
C) A herbivore
D) A producer
E) An omnivore
3. What is a primary consumer in a food chain?
A) A plant
B) A predator
C) A herbivore
D) A parasite
E) A scavenger
4. In a grass → rabbit → fox food chain, the fox is:
A) A primary consumer
B) A secondary consumer
C) A producer
D) A decomposer
E) An autotroph
5. Which organism is a producer?
A) Snake
B) Mushroom
C) Grass
D) Hawk
E) Dog
6. Which of the following is a tertiary consumer?
A) Grass
B) Cow
C) Deer
D) Lion
E) Tree
7. Which of these food chains is correctly ordered?
A) Snake → Grass → Mouse
B) Hawk → Rabbit → Grass
C) Grass → Rabbit → Fox
D) Lion → Deer → Plant
E) Mouse → Cat → Cheese
8. What role do decomposers play in a food chain?
A) They are always at the top of the chain
B) They convert sunlight into energy
C) They break down dead organisms, recycling nutrients
D) They serve as primary consumers
E) They make their own food
9. A food chain always begins with:
A) A consumer
B) A carnivore
C) A decomposer
D) A predator
E) A producer
10. Which of the following could be an example of a simple aquatic food chain?
A) Algae → Small fish → Big fish
B) Small fish → Algae → Plankton
C) Plankton → Whale → Seal
D) Big fish → Crab → Seaweed
E) Shark → Algae → Fish
11. Which organism in a food chain gets the least energy?
A) Primary producer
B) Primary consumer
C) Secondary consumer
D) Tertiary consumer
E) Decomposer
12. What is a trophic level?
A) The number of organisms in a population
B) The habitat in which a species lives
C) The position an organism occupies in a food chain
D) The number of prey an animal consumes
E) The height an animal lives above sea level
13. In a food chain, energy flows:
A) From consumers to producers
B) From decomposers to consumers
C) In a circular loop
D) From producers to consumers
E) From omnivores to carnivores
14. Which of these is a top predator in a typical terrestrial food chain?
A) Mouse
B) Grasshopper
C) Snake
D) Lion
E) Deer
15. Which organism would be a secondary consumer in this chain: Plant → Caterpillar → Bird → Hawk?
A) Plant
B) Caterpillar
C) Bird
D) Hawk
E) Fungi
16. Which term describes organisms that feed on both plants and animals?
A) Herbivores
B) Carnivores
C) Omnivores
D) Detritivores
E) Autotrophs
17. Which of these is not a correct part of a typical food chain?
A) Producer
B) Primary consumer
C) Solar energy
D) Decomposer
E) Herbivore
18. What happens when the primary consumer is removed from a food chain?
A) Producers increase, predators decrease
B) The chain becomes more productive
C) The decomposers stop working
D) Producers die out
E) The top predator increases
19. A food web differs from a food chain because it:
A) Includes decomposers
B) Is not related to energy flow
C) Shows multiple feeding relationships
D) Has fewer species
E) Starts with a consumer
20. What is the final role in most food chains?
A) Producer
B) Consumer
C) Scavenger
D) Predator
E) Decomposer
Answer Key with Explanations
1. D – A food chain is a linear sequence showing how energy is transferred from one organism to another through feeding relationships.
2. D – Producers, such as plants and algae, are always the first organisms in a food chain.
3. C – Primary consumers are herbivores that eat producers.
4. B – The fox is a secondary consumer; it eats the rabbit (primary consumer).
5. C – Grass is a producer because it creates its own food via photosynthesis.
6. D – A lion is a tertiary consumer that feeds on secondary consumers like hyenas or zebras.
7. C – Grass → Rabbit → Fox is the correct sequence from producer to top predator.
8. C – Decomposers recycle nutrients by breaking down dead plants and animals.
9. E – A food chain always starts with a producer.
10. A – This sequence accurately reflects a basic aquatic food chain: algae (producer) → small fish (primary consumer) → big fish (secondary consumer).
11. D – Tertiary consumers receive the least energy because energy decreases up the trophic levels.
12. C – A trophic level indicates an organism’s position in the food chain.
13. D – Energy flows from producers (like plants) to consumers (like herbivores and carnivores).
14. D – Lions are apex predators in many land ecosystems.
15. C – The bird eats the caterpillar (a primary consumer), making it a secondary consumer.
16. C – Omnivores feed on both plant and animal material.
17. C – Solar energy powers ecosystems but is not a "link" in the food chain itself.
18. A – Without primary consumers, producers grow unchecked and predators lose food.
19. C – A food web shows multiple food chains and more complex feeding relationships.
20. E – Decomposers finish the food chain by breaking down organic matter and returning nutrients to the ecosystem.
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