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
Amino acids/proteins
Nucleic acids (DNA/RNA)
Step 2
Correct answer in the range 90 to 133.2 scores 2 marks
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Answer
For the year 1970, the yield was calculated to be between 170.8 to 176.4 kg grain per kg of fertiliser.
For the year 2005, the yield ranged from 266.4 to 304.0 kg grain per kg of fertiliser.
Step 3
Using more but getting less response over time.
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Answer
Over time, the use of artificial fertiliser becomes less effective.
The graph shows correlation but doesn't prove changes in yield are solely due to fertiliser; there may be other factors.
Generally, as more fertiliser is used, the efficiency tends to decrease.
