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Decomposers and recycling nutrients

5th grade (Year 6 in England) · 16 questions · Common Core: NGSS.5-LS2-1, NGSS.MS-LS2-3 · England: KS3 Biology: Interactions and interdependencies

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1
Question 1
Why are decomposers important for plants?
- A. They eat plant pests only
- B. They make plants grow faster in the dark
- C. They give plants sunlight
- D. They release nutrients (minerals) back into the soil
2
Question 2
Decomposers: which statement is NOT true?
- A. Matter is recycled in an ecosystem.
- B. Decomposition is faster when it is warm and moist.
- C. Fungi and bacteria are decomposers.
- D. Decomposers work fastest when frozen.
3
Question 3
Is a owl a producer, a consumer or a decomposer?
- A. producer
- B. consumer
- C. decomposer
4
Question 4
Why are decomposers important for plants?
- A. They eat plant pests only
- B. They give plants sunlight
- C. They release nutrients (minerals) back into the soil
- D. They make plants grow faster in the dark
5
Question 5
Decomposers: which statement is NOT true?
- A. Matter is recycled in an ecosystem.
- B. Decomposers work fastest when frozen.
- C. Decomposers return nutrients to the soil.
- D. Fungi and bacteria are decomposers.
6
Question 6
Is a mould (mold) on bread a producer, a consumer or a decomposer?
- A. producer
- B. consumer
- C. decomposer
7
Question 7
What do decomposers do?
- A. pollinate flowers
- B. make food from sunlight
- C. break down dead plants and animals
- D. hunt living animals
8
Question 8
Decomposers: which statement is NOT true?
- A. Decomposers return nutrients to the soil.
- B. Decomposers work fastest when frozen.
- C. Fungi and bacteria are decomposers.
- D. Matter is recycled in an ecosystem.
9
Question 9
Is a oak tree a producer, a consumer or a decomposer?
- A. producer
- B. consumer
- C. decomposer
10
Question 10
Compost heaps rot faster when they are…
- A. completely dry
- B. sealed in plastic with no air
- C. frozen
- D. warm, moist and have air
11
Question 11
Decomposers: which statement is NOT true?
- A. Decomposition is faster when it is warm and moist.
- B. Matter is recycled in an ecosystem.
- C. Decomposers return nutrients to the soil.
- D. Dead leaves just disappear on their own.
12
Question 12
Is a soil bacteria a producer, a consumer or a decomposer?
- A. producer
- B. consumer
- C. decomposer
13
Question 13
Why are decomposers important for plants?
- A. They eat plant pests only
- B. They make plants grow faster in the dark
- C. They release nutrients (minerals) back into the soil
- D. They give plants sunlight
14
Question 14
Decomposers: which statement is NOT true?
- A. Decomposers work fastest when frozen.
- B. Matter is recycled in an ecosystem.
- C. Decomposition is faster when it is warm and moist.
- D. Fungi and bacteria are decomposers.
15
Question 15
Is a mushroom a producer, a consumer or a decomposer?
- A. producer
- B. consumer
- C. decomposer
16
Question 16
Why are decomposers important for plants?
- A. They give plants sunlight
- B. They make plants grow faster in the dark
- C. They eat plant pests only
- D. They release nutrients (minerals) back into the soil

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Answer key: Decomposers and recycling nutrients

1. D. They release nutrients (minerals) back into the soil
2. D. Decomposers work fastest when frozen.
3. B. consumer
4. C. They release nutrients (minerals) back into the soil
5. B. Decomposers work fastest when frozen.
6. C. decomposer
7. C. break down dead plants and animals
8. B. Decomposers work fastest when frozen.
9. A. producer
10. D. warm, moist and have air
11. D. Dead leaves just disappear on their own.
12. C. decomposer
13. C. They release nutrients (minerals) back into the soil
14. A. Decomposers work fastest when frozen.
15. C. decomposer
16. D. They release nutrients (minerals) back into the soil