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Question 21M.1.HL.TZ2.31

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1.HL.TZ2.31
Level HL Paper 1 Time zone TZ2
Command term Question number 31 Adapted from N/A
31.
[Maximum mark: 1]
21M.1.HL.TZ2.31

The Hill reaction occurs when isolated chloroplasts are exposed to sunlight in the presence of DCPIP. DCPIP replaces NADP as the final electron acceptor for the light-dependent reactions of photosynthesis. What are products of the Hill reaction?

A. H2O and ATP

B. ATP and CO2

C. O2 and ATP

D. C6H12O6 and O2

[1]

Markscheme

C

Examiners report

Some G2 responses mentioned that the Hill reaction does not appear in the Understandings in the guide, only in the Aims in the right-hand column in Section 8.3 (Photosynthesis). It was assumed most teachers would have mentioned the Hill reaction when covering this part of the guide, and for those who were unfamiliar with the name Hill the question included an explanation of the reaction. Statistically, the question performed well.

Syllabus sections