Xerophytes 0.0 / 5 ? BiologyBiological molecules, organic chemistry and biochemistryA2/A-levelAQA Created by: HindleycCreated on: 03-06-18 11:47 What are xerophytes? Plants adapted to conditions where water loss Is greater than its availability 1 of 12 Where are they found? Arctic desert and sea shore 2 of 12 What are the 3 general forms of adaptation designed to conserve water? Reduction in transpiration rate, storage of water- succulents, uptake more water 3 of 12 How do they reduce transpiration rate? Most have few stomata, thick cuticle acting as waxy barrier to prevent water loss 4 of 12 What do hinges cells enable? Leaves to curl into a tube- water cannot diffuse through stomata as it is confined to inner surface 5 of 12 What does a hairy epidermis do? Traps moist air in hair layer which decreases diffusion path 6 of 12 What do sunken stomata do? Traps most air above stomata decreasing diffusion path 7 of 12 What do cacti have? A reduced SA of leaves small and circular reducing transpiration and helps give rigidity when wilting 8 of 12 What is Photosynthesis carried out by. then? Stem or petiole 9 of 12 How do they store water? Succulent leaves and stems that store water 10 of 12 So why do they have spines for leaves? to deter desert animals as this can be attractive for them 11 of 12 How do they uptake water? 2 sets of roots- sideways to collect surface water from occasional showers and deep penetrating roots to obtain water from a deep water table 12 of 12
Essay 3: The rising temperatures may result in physiological and ecological effects on living organisms. Describe and explain these effects. 0.0 / 5
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