A plant breeder prepares young pea plants for a trial. After keeping them in darkness, she removes a leaf from a spare plant and tests it with iodine before starting the trial.
Why does she test this leaf?
to check that the leaf contains chlorophyll before the trial begins
to check that the plant has stopped respiring before the trial begins
to check that no starch remains in the leaf before the trial begins
to check that carbon dioxide has entered the leaf before the trial begins
117 exam-style questions on OCR GCSE Biology 1.4 Photosynthesis, covering 1.4.1 Photosynthesisers as biomass producers, 1.4.2 Factors affecting the rate of photosynthesis, and 1.4.3 Limiting factors in photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.