DP Biology (first assessment 2025)

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Question SPM.1A.HL.TZ0.21

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.HL.TZ0.21
Level HL Paper 1A Time zone TZ0
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
SPM.1A.HL.TZ0.21

What is the cause of positive phototropism?


A.  Increased concentration of auxin on the side of the stem closest to the light

B.  Degradation of auxin on the side of the stem closest to the light

C.  Increased concentration of auxin on the side of the stem furthest from the light

D.  Degradation of auxin on the side of the stem furthest from the light

[1]

Markscheme

C

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