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 respiratio... 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 reaction that produces water is aerobic respiration. This reaction occurs when glucose is broken down in the presence of oxygen, releasing energy, carbon dioxide, and water as byproducts.
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, first calculate 4.5% of the world population:
6,000,000,000 imes rac{4.5}{100} = 270,000,000
Thus, the number of people who had severe water shortage is 2.7×108.
Step 4
Why do more people have severe water shortage now than in 2007?
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Answer
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 fallen leaves, breaking them down into simpler organic and inorganic materials. During this process, they release carbon dioxide back into the soil, which can then be utilized by plants for photosynthesis, promoting new plant growth.
Step 6
What is one benefit of fallen leaves for living plants?
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Answer
One benefit of fallen leaves for living plants is that nitrates are released into the soil. This enhances soil fertility, providing essential nutrients for plant growth.
