DP Biology (first assessment 2025)

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Question 21M.1A.HL.TZ1.32

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.HL.TZ1.32
Level HL Paper 1A Time zone TZ1
Command term Question number 32 Adapted from N/A
32.
[Maximum mark: 1]
21M.1A.HL.TZ1.32

Which process does not take place in the stroma of chloroplasts?

A. Synthesis of carbohydrates

B. Fixation of carbon

C. Reduction of NADP

D. Synthesis of ribulose bisphosphate

[1]

Markscheme

C

Examiners report

Answers were divided almost equally between the four possible answers in this question suggesting a lot of guesswork but the discrimination index shows that better-prepared candidates tended to answer correctly. Arguably none of the answers is completely correct. Shrewd candidates could eliminate answers A and D, because if D, was correct, A was also, and both could not be correct. Reduction of NADP was the expected answer but arguably it occurs in the stroma, as the reaction takes place adjacent to the outer surface of the thylakoid membrane. Even so, this was the best answer.

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