This question is about the cycling of water and carbon in ecosystems - AQA - GCSE Biology Combined Science - Question 1 - 2022 - Paper 2
Question 1
This question is about the cycling of water and carbon in ecosystems.
Which reaction produces water?
Tick (✔) one box.
Aerobic respiration
Anaerobic respiration... show full transcript
Worked Solution & Example Answer:This question is about the cycling of water and carbon in ecosystems - AQA - GCSE Biology Combined Science - Question 1 - 2022 - Paper 2
Step 1
Which reaction produces water?
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Answer
The correct answer is Aerobic respiration, as it is the only reaction among the options provided that produces water.
Step 2
Name the processes 1 to 5 shown on Figure 1.
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Answer
evaporation
condensation
precipitation
drainage
transpiration
Step 3
Calculate how many people had severe water shortage.
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Answer
To find the number of people with severe water shortage, we need to calculate 4.5% of the world's population in 2007:
ext{Number of people} = 6,000,000,000 imes rac{4.5}{100} = 270,000,000
In standard form, this is written as 2.7×108.
Step 4
Why do more people have severe water shortage now than in 2007?
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Answer
Tick these two boxes:
Climate change has increased the area of deserts.
More water is used to grow crops.
Step 5
Explain how microorganisms recycle carbon from the leaves.
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Answer
Microorganisms in the soil decompose the fallen leaves, breaking them down into simpler substances. During this process, respiration occurs, releasing carbon dioxide back into the atmosphere, which can then be reused by plants for photosynthesis, facilitating new plant growth.
Step 6
What is one benefit of fallen leaves for living plants?
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Answer
The correct answer is: Nitrates are released into the soil, which enriches the soil and supports plant growth.
