10th grade ecosystems and food chains
10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-LS2-1, NGSS.HS-LS2-2, NGSS.HS-LS2-7, NGSS.HS-LS4-6 · England: KS4 Combined Science: Ecosystems, GCSE Combined Science: Ecology
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Date
Score/ 16
Question 1
Decay: which statement is NOT true?
- A. Decay is fastest when everything is frozen.
- B. Decomposers include bacteria and fungi.
- C. Compost can be used as a natural fertiliser.
- D. Decay is faster when it is warm and moist.
Question 2
Why is high biodiversity good for an ecosystem?
- A. It makes the ecosystem more stable because species depend on many others
- B. It stops the water cycle
- C. It removes all predators
- D. It means fewer species compete
Question 3
A biogas generator lets waste decay without oxygen. What useful gas does it produce?
- A. nitrogen
- B. helium
- C. methane, which can be burned as a fuel
- D. oxygen
Question 4
A bag of grass clippings had a mass of 120 g. After 10 days in a compost bin its mass was 70 g. What was the mean rate of decay, in g per day?
Answer
Question 5
Five 1 m² quadrats contained these numbers of daisies: 4, 6, 4, 6, 11. What is the mean number of daisies per quadrat?
Answer
Question 6
The mean number of buttercups in a 1 m² quadrat is 15. The field is 500 m². Estimate the number of buttercups in the field.
Answer
Question 7
Biodiversity: which statement is NOT true?
- A. Global warming is changing where some species can live.
- B. Human activity has no effect on extinction rates.
- C. Breeding programmes can help protect endangered species.
- D. Deforestation reduces biodiversity and adds carbon dioxide to the air.
Question 8
A survey found 250 breeding pairs of a bird species in 2010 and 212.5 in 2024. What was the percentage decrease?
Answer%
Question 9
How can you see how plant species change from a hedge to the middle of a field?
- A. Place quadrats at regular intervals along a transect line
- B. Place one quadrat by the hedge only
- C. Count only the tallest plants
- D. Sample at night
Question 10
Decay: which statement is NOT true?
- A. Decay returns mineral ions to the soil.
- B. Compost can be used as a natural fertiliser.
- C. Decay is faster when it is warm and moist.
- D. Decay is fastest when everything is frozen.
Question 11
Which action helps increase biodiversity on farmland?
- A. growing one crop everywhere
- B. removing all hedges
- C. planting hedgerows and leaving wildflower field margins
- D. spraying more insecticide
Question 12
What role do decomposers play in the carbon cycle?
- A. They lock carbon away forever
- B. They turn carbon into oxygen
- C. They respire, releasing carbon dioxide from dead material back into the air
- D. They photosynthesise
Question 13
A bag of grass clippings had a mass of 150 g. After 10 days in a compost bin its mass was 135 g. What was the mean rate of decay, in g per day?
Answer
Question 14
Five 1 m² quadrats contained these numbers of daisies: 2, 10, 8, 10, 4. What is the mean number of daisies per quadrat?
Answer
Question 15
The mean number of buttercups in a 1 m² quadrat is 5. The field is 50 m². Estimate the number of buttercups in the field.
Answer
Question 16
Biodiversity: which statement is NOT true?
- A. Deforestation reduces biodiversity and adds carbon dioxide to the air.
- B. Breeding programmes can help protect endangered species.
- C. Global warming is changing where some species can live.
- D. Biodiversity means the number of individuals of one species.
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