Farmers use artificial fertilisers to maintain or increase yield from grain-producing crop plants such as wheat - AQA - A-Level Biology - Question 3 - 2017 - Paper 1
Question 3
Farmers use artificial fertilisers to maintain or increase yield from grain-producing crop plants such as wheat.
Artificial fertiliser is used to replace mineral io... show full transcript
Worked Solution & Example Answer:Farmers use artificial fertilisers to maintain or increase yield from grain-producing crop plants such as wheat - AQA - A-Level Biology - Question 3 - 2017 - Paper 1
Step 1
Give two examples of biological molecules containing nitrogen that would be removed when a crop is harvested.
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Answer
Nucleic acid (DNA/RNA)
Amino acids/proteins
Step 2
Correct answer in the range 90 to 133.2 scores 2 marks.
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Answer
In 1970, the yield was approximately 170.8 to 176.4 kg per hectare, and in 2005, it was approximately 266.4 to 304.0 kg per hectare.
Step 3
Using more but getting less response over time.
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Answer
Over time, the effectiveness of artificial fertiliser decreases, requiring more to achieve similar yields.
The correlation shown may indicate that other agricultural practices also influence yield, not just fertiliser use.
