Cell Introduction 2. Cell Structure 3. Membrane Structure 4. Membrane Transport 5. Origin of Cells 6. Cell Division 2: Molecular Biology 1. Metabolic Molecules 2.
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Home » Past Questions » Biology » A xerophyte conserves water by possession of the following features except. C broad leaves. A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice- or snow-covered region in the Alps or the Arctic.
Popular examples of xerophytes are cacti and pineapple plants. Certain xerophytes have a waxy covering over their stomata, thus curbing water loss. Others contain very few stomata, or stomata that only open at night when it's cooler. Each of these adaptations limits water loss and allows the plant to survive in dry environments. The presence of a thick waxy cuticle also helps to cut down water loss by acting as a barrier to evaporation. What factors affect the water balance?
Water intake and water loss. The most marks for questions about xerophytes usually come from adaptations concerning limiting water loss. Xerophytic plants often have very thick waxy cuticles surrounding their epidermal tissues outer cell layers to prevent water loss by transpiration water diffusing out of cells and evaporating into the air.
They also have few stomata, and those they have are retracted inside the leaf to protect them from the dry, moving air which increases the diffusion pathway distance and so reduces the rate of water loss. These sunken stomata also tend to remain closed during the day to reduce water loss during warmer hours and only open by necessity for storing fresh CO2 at night.
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