The diagram shows one of the stages of the nitrogen cycle - Edexcel - GCSE Biology - Question 3 - 2013 - Paper 1
Question 3
The diagram shows one of the stages of the nitrogen cycle.
(a) (i) Complete the sentence by putting a cross (X) in the box next to your answer.
The name of this sta... show full transcript
Worked Solution & Example Answer:The diagram shows one of the stages of the nitrogen cycle - Edexcel - GCSE Biology - Question 3 - 2013 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The name of this stage is: C nitrification. This process converts ammonia in the soil into nitrates.
Step 2
Explain how plants use the nitrates from the soil.
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Answer
Plants absorb nitrates from the soil to utilize them in the synthesis of proteins, which are essential for their growth and development.
Step 3
Describe how the over-use of nitrate fertilizers can cause eutrophication.
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Answer
The over-use of nitrate fertilizers can lead to runoff into water bodies, resulting in nutrient enrichment. This excess nitrogen causes rapid algal blooms, which deplete oxygen levels in the water as the algae die and decompose, leading to aquatic dead zones where other organisms cannot survive.
