CAIE A-Level Biology AS 7.2.5 Xerophytic Adaptations Questions
Explain xerophytic adaptations that reduce water loss using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain xerophytic adaptations that reduce water loss in plants.
CAIE A-Level Biology AS 7.2.5 Xerophytic Adaptations Questions question 1
Nerium oleander is a xerophytic plant. A photomicrograph of a section through the leaf of N. oleander is shown in Fig. 3.1.
Fig. 3.1
The leaf shown in Fig. 3.1 has a number of adaptations to reduce water loss by transpiration. Two of these adaptations are:
- a multilayered epidermis
- stomata only found in depressions, known as stomatal crypts, on the lower surface of the leaf.
Explain how a multilayered epidermis and stomatal crypts will help to reduce water loss in N. oleander.
multilayered epidermis
stomatal crypts
Sucrose, amino acids and other assimilates synthesised in palisade mesophyll cells of N. oleander pass to the vein, where they can be transported within specialised cells from the source to the sink.
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