In some rice-growing parts of the world, farmers use a combination of paddy fields and a fish farm. Rice paddy fields are flooded for much of the growing cycle and water running off the fields flows through pens where fish are raised. Nitrogen-based fertilisers are generally very soluble in water.
Which problems could result from farmers applying excess nitrogen-based fertilisers to their paddy fields?
1 decreased fish production in the fish pens
2 decreased levels of oxygen in the water
3 increased growth of algae in the fish pens

Q: What topic does this question test?

This question tests Nitrogen and sulfur in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2016 examination, Paper 1 Variant 2 (9701_m16_qp_12.pdf).

Question

In some rice-growing parts of the world, farmers use a combination of paddy fields and a fish farm. Rice paddy fields are flooded for much of the growing cycle and water running off the fields flows through pens where fish are raised. Nitrogen-based fertilisers are generally very soluble in water.
Which problems could result from farmers applying excess nitrogen-based fertilisers to their paddy fields?
1 decreased fish production in the fish pens
2 decreased levels of oxygen in the water
3 increased growth of algae in the fish pens

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The correct answer is A: 1, 2 and 3 are correct.

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