AQA GCSE Biology · 8461
Specification 4.3.3.1 · Paper 1
Revise: Disease Detection in PlantsBecause chlorophyll is needed for photosynthesis, severe magnesium deficiency can also reduce the plant's ability to make the substances needed for growth. In an exam answer, however, the essential specified link is that magnesium is needed to make chlorophyll and its deficiency causes chlorosis.