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3.5 Energy transfers in and between organisms
Quick questions on Photosynthesis: light-dependent reactions, the Calvin cycle and limiting factors - AQA A-Level Biology
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the light-independent reactions (Calvin cycle)?Show answer
These take place in the stroma and do not directly need light, but they depend on the ATP and reduced NADP made by the light-dependent stage. The cycle has three steps.
What are limiting factors?Show answer
The rate of photosynthesis is set by whichever factor is in shortest supply. The three you must know are light intensity, carbon dioxide concentration and temperature.
What is q1?Show answer
State precisely where in the chloroplast the light-dependent and light-independent reactions occur. [2 marks]
What is q2?Show answer
Explain why the oxygen released in photosynthesis comes from water and not carbon dioxide. [2 marks]
What is q3?Show answer
A plant is moved from bright light into darkness. Explain what happens to the concentrations of GP and RuBP in the next few seconds. [3 marks]
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