Transpiration and translocation
- Created by: Serena_123
- Created on: 12-01-17 18:58
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- Transpiration and Translocation
- In plants xylem tissue transports water and minerals from the roots to the leaves and phloem tissue transports sugars from the leaves to the growing regions
- Xylem - dead cells from a tube supported by lignen walls
- Phloem - living cells separated by sieve plates and supported by companion cells
- Transpiration stream is the movement of water up the plant as water is lost from the leaves by evaporation
- Carbon Dioxide enters the leaves through the stomata by diffusion
- The cells that control the opening and closing of the stomata are called guard cells
- Oxygen and water vapour exit the leaves through the stomata by diffusion
- Factors that can change the rate of transpiration
- Wind increases evaporation rate
- Temperature affects evaporation rate
- Light affects evaporation rate by controlling the opening and closing of the stomata
- The stomata open more in more light to allow carbon dioxide in for photosynthesis so transpiration occurs more in the day than night
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