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Exam Objective Describe with the aid of diagrams and photographs, how the leaves of some xerophytes are adapted to reduce water loss by transpiration.

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Presentation on theme: "Exam Objective Describe with the aid of diagrams and photographs, how the leaves of some xerophytes are adapted to reduce water loss by transpiration."— Presentation transcript:

1 Exam Objective Describe with the aid of diagrams and photographs, how the leaves of some xerophytes are adapted to reduce water loss by transpiration

2 Xerophytes These live in  Hot, dry desert regions  Cold regions where soil water is frozen for most of the year  Exposed, windy locations

3 Introduction Xerophytes are plants that have adaptations to reduce water loss by transpiration

4 Examples of xerophytes

5 Sections through xerophyte leaves

6 Cactus Has spines instead of leaves, to reduce water loss The stem (cactus pad) is green and contains chlorophyll, acting as leaves do in other plants

7 Taken from Xerophyte Question in OCR Green Book on Moodle

8 Xerophytes – some key ideas xerophytes = plants living where water is in short supply transpiration reduced extensive roots thick, waxy cuticle stem stores water small leaf surface areawater potential gradient rolled leafsunken stomata absence of leaves stomata open at night / close in day stomata surrounded by hairs


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