Water movement through plants • How does water move through a plant? – Which part of the plant does water enter? – Which part of the plant does water leave? • What do you know already? – With the person next to you discuss for 1 minute what you already know about the movement of water through plants
Water movement through plants. How does water move through a plant? Which part of the plant does water enter? Which part of the plant does water leave? What do you know already? With the person next to you discuss for 1 minute what you already know about the movement of water through plants. - PowerPoint PPT Presentation
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Water movement through plants
• How does water move through a plant?– Which part of the plant does water enter?– Which part of the plant does water leave?
• What do you know already?– With the person next to you discuss for 1 minute
what you already know about the movement of water through plants
Transpiration • Transpiration is the movement of water molecules
through the plant. Up from the roots, through Xylem vessels and evaporating out through the stomata in the leaves.
• Certain conditions affect the rate of transpiration.If it is warm, water is lost because of the increased movement of the molecules. The wind will blow away molecules near the stomata. Humidity will slow down water loss because the concentration gradient is small.
Transpiration in plants
• Root hairs give plant roots a large surface area.
• Why do you think they have no chloroplasts?
Evaporation and transpiration
• Evaporation is the process of a liquid turning to gas.
• Transpiration is the release of water vapour from a plant through the leaves, causing water to move through the plant.
Xylem
• The xylem carries water and minerals from the roots to the leaves
• The cellulose cell walls contain extra layers of a chemical called lignin.
• Once xylem cells have formed the xylem they die making long thin vessels for water to move through
Phloem
• The phloem carries dissolved food such as sugars from the leaves to other areas of the plant
• Phloem cells are alive. If they are damages they cannot work properly.
Xylem & PhloemXylem Tissue • made of Tracheid cells •transports water from root to leaves via -
a. Capillary Action
b. Transpiration Pull
Phloem Tissue• Made of sieve tubes and companion cells• Transports food (organic molecules) from leaf