DP Biology (first assessment 2025)

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Question 19M.1A.HL.TZ1.31

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1A.HL.TZ1.31
Level HL Paper 1A Time zone TZ1
Command term Compare Question number 31 Adapted from N/A
31.
[Maximum mark: 1]
19M.1A.HL.TZ1.31

Which process is common to photosynthesis and cell respiration?

A. Photolysis

B. The Calvin cycle

C. The Krebs cycle

D. Chemiosmosis

[1]

Markscheme

D

Examiners report

This wasn’t an exciting question but was the best discriminator on the exam, with nearly two thirds of candidates identifying chemiosmosis as a process that occurs in both photosynthesis and respiration.

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