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Photosynthesis

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Question 9

Which of the statements about the light-dependent and light-independent stages of photosynthesis is/are correct?

  1. During the light-dependent stage, the photolysis of water occurs on the stroma-facing side of the thylakoid membrane to directly increase the proton concentration in the stroma.
  2. At high light intensities, raising the temperature from 15 ∘C15\ ^\circ\text{C}15 ∘C to 30 ∘C30\ ^\circ\text{C}30 ∘C has a greater stimulatory effect on the rate of triose phosphate (TP) synthesis than on the rate of photophosphorylation.
  3. If a herbicide blocks electron transport from photosystem II, the concentration of ribulose bisphosphate (RuBP) in the stroma will eventually decrease.
A

Only 1 and 2 are correct

B

Only 2 and 3 are correct

C

Only 1 and 3 are correct

D

1, 2 and 3 are correct

Markscheme

Photosynthesis Questions

  1. A Level
  2. /Biology
  3. /Photosynthesis

16 exam-style questions on OCR A A Level Biology Photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.

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