DP Biology (first assessment 2025)

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Question 20N.1A.HL.TZ0.33

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1A.HL.TZ0.33
Level HL Paper 1A Time zone TZ0
Command term Question number 33 Adapted from N/A
33.
[Maximum mark: 1]
20N.1A.HL.TZ0.33

How does auxin exert its effect on plant cells?

A. Acts directly on the cell wall, causing expansion

B. Binds to a receptor resulting in expression of genes

C. Causes the vacuole to absorb water and expand the cell

D. Causes the cell to undergo cell division

[1]

Markscheme

B

Examiners report

Only 42 % of candidates were able to pick out how auxin exerts its effects on plant cells and all the four answers attracted significant numbers of candidates, suggesting a widespread lack of knowledge of this aspect of plant physiology.

Syllabus sections