1. Module 2 Exchange and transport 1.2.18 Reducing water loss

2. Learning Objectives Success Criteria To understand xerophytes and understand how they are adapted to reduce water loss To be able to understand how specific plants are adapted Define the term xerophyte (Grade D – C) Explain why transpiration is a consequence of gas exchange (Grade C –B) Describe, with the aid of diagrams, how the leaves of some xerophytes are adapted to reduce water loss (Grade B – A)

3. Xerophyte A plant adapted to living in a dry arid habitat; a desert plant Task Complete the table explaining how each of the adaptations reduce water loss. Include keywords Transpiration Water potential Water vapour potential Define the term xerophyte (Grade D – C) Explain why transpiration is a consequence of gas exchange (Grade C –B)

4. Research ICT task In the greenhouse there are several different type of xerophytes – Choose at least 3 different xerophytes and identify all their adaptations to living in arid/dry conditions Describe, with the aid of diagrams, how the leaves of some xerophytes are adapted to reduce water loss (Grade B – A)

5. Plenary Xerophytes are plants living in desert habitats where the conditions are very …………….. Their leaves show a variety of modifications to ……………….. transpiration. Many have a thick ……………… cuticle. Their leaves may be covered with hairs which trap ……………. …………….. In some, the leaves are in the form of needles which reduces their surface area. Their ……………. are often sunken into pits in the surface of the leaf or stem. [5]