A plant is moved from bright light to darkness. What happens to the levels of GP and RuBP in the Calvin cycle?

Answer and explanation

Correct answer: A. GP increases and RuBP decreases

  1. Step 1: Without light, ATP and reduced NADP run out. Step 2. GP cannot be reduced so it builds up, and less RuBP is regenerated. Answer: GP up, RuBP down. Why not the others: these misread the cycle.

Practise more Respiration, Photosynthesis and Transport.

Free questions with an explanation for every one, and full timed Cambridge A-Level mock tests.