A-LevelBiologyBiodiversity and conservation9700/12 · May/June 2015 · Q391 Mark

A farmer grows a different crop in a field each year for three years. In the fourth year he grows a leguminous crop, such as clover, and then ploughs this into the soil. The next year he starts the rotation again. How does the fourth year crop add mineral ions to the soil?

Ano decomposition; yes nitrification; yes nitrogen fixation

Byes decomposition; no nitrification; yes nitrogen fixation

Cyes decomposition; yes nitrification; no nitrogen fixation

Dyes decomposition; yes nitrification; yes nitrogen fixation

✓ Correct answer

D: yes decomposition; yes nitrification; yes nitrogen fixation

Oracle Prep sorts past-paper questions by topic, so you can drill Biodiversity and conservation and see which topics are most likely to come up next.

Topic: Biodiversity and conservation, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2015 Paper 1 Variant 2, question 39.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content