DP Biology (first assessment 2025)

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Question 22N.2.HL.TZ0.5d

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.HL.TZ0.5d
Level HL Paper 2 Time zone TZ0
Command term Outline Question number d Adapted from N/A
d.
[Maximum mark: 2]
22N.2.HL.TZ0.5d
(d)

Outline two adaptations for water conservation in leaves of desert plants.

[2]

Markscheme

Mark the first two answers only
(thick) wax layer/cuticle;
hairs on leaves/rolled leaves;
sunken stomata/stomata in pits/stomata opening at night/CAM physiology;
(leaves reduced to) spines/needles/no/few/small leaves/low surface area (to volume ratio) of leaves;
thick stems/water storage tissue/vertical stems (to avoid most intense sunlight);

Examiners report

A wide range of leaf adaptations were suggested and most candidates gave one or two that were accepted. Root adaptations were not accepted as the question asked for features of leaves.

Syllabus sections