A plant grown in soil containing very few magnesium ions has pale yellow leaves. Why is its rate of photosynthesis low?
It cannot take in enough water, so less light energy is absorbed
It cannot make enough chlorophyll, so less light energy is absorbed
It cannot make enough chlorophyll, so less carbon dioxide is absorbed
It cannot take in enough water, so less carbon dioxide is absorbed
54 exam-style questions on AQA GCSE Biology 4.1 Photosynthesis, covering 4.1.1 Photosynthetic reaction, 4.1.2 Rate of photosynthesis, and 4.1.3 Uses of glucose from photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.