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Module 5: Communication, homeostasis and energy
Quick questions on Photosynthesis: light-dependent reactions, the Calvin cycle and limiting factors - OCR A-Level Biology A
7short 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 chloroplast structure?Show answer
The chloroplast is adapted to its two stages:
What is the light-dependent stage (in the thylakoid membranes)?Show answer
Light energy is converted into chemical energy in ATP and reduced NADP:
What is the light-independent stage (the Calvin cycle, in the stroma)?Show answer
The Calvin cycle fixes carbon dioxide into sugars using the ATP and reduced NADP from the light-dependent stage:
What are limiting factors?Show answer
The rate of photosynthesis is limited by whichever factor is in shortest supply:
What is q1?Show answer
State the products of the light-dependent stage that are used in the Calvin cycle. [2 marks]
What is q2?Show answer
Explain where the oxygen released in photosynthesis comes from. [2 marks]
What is q3?Show answer
Name the enzyme that catalyses the fixation of carbon dioxide onto RuBP. [1 mark]
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