(AQA GCSE B3.1.2) Exchange Systems and Water Loss in Plants
- Created by: Em
- Created on: 17-04-13 18:43
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- Exchange Systems in Plants
- Carbon dioxide (CO2) diffuses in, required for photosynthesis
- Oxygen (O2) diffuses out of the leaf as a byproduct of photosynthesis
- At night, more respiration occurs than photosynthesis and therefore CO2 diffuses out
- Water and mineral ions diffuse through the roots. Roots increase surface area with root hair cells.
- Leaves are flat and thin which shortens the diffusion distance. Inside the leaf, mesophyll cells are loosely packed which means there is a lot of surface area for substances to diffuse through and for oxygen to diffuse out.
- Carbon dioxide (CO2) diffuses in, required for photosynthesis
- Water Loss in Plants
- Water travels from roots to leaves where a large proportion is used for photosynthesis.
- Transpiration, water evaporates from the leaves. Varies depending on environment e.g. dry, windy, and hot climates, more evaporation (heat energy, water particles moved away, and concentration gradient).
- Guard cells around stomata (which let CO2 in) open and close depending on conditions, for example if it is hot they will shut to a certain degree to reduce water loss.
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