DP Biology (first assessment 2025)

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Question 21M.1A.HL.TZ2.34

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.HL.TZ2.34
Level HL Paper 1A Time zone TZ2
Command term Question number 34 Adapted from N/A
34.
[Maximum mark: 1]
21M.1A.HL.TZ2.34

How does auxin contribute to phototropism?

A. It increases production of light-sensitive proteins.

B. It increases growth of cells on the shaded side of the stem.

C. It inhibits growth of axillary buds.

D. It inhibits stem elongation.

[1]

Markscheme

B

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