Evaporation and transpration
- Created by: jakeharris12345
- Created on: 22-04-18 19:55
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- Evaporation and transpiration
- water loss from leaves
- stomata - small openings across a leaf surface
- stomata can be opened when air enters leaves
- CO2 from atmosphere diffuses into air spaces and then into cells down a concentration gradient
- at same time, oxygen from photosynthesis is removed from leaf by diffusion in surrounding air
- size of stomata and their opening and closing is controlled by guard cells
- CO2 from atmosphere diffuses into air spaces and then into cells down a concentration gradient
- stomata can be opened when air enters leaves
- loss of water vapour is called transpiration
- as water evaporates from leaf surface, more water is pulled up through the xylem
- this is the transpiration stream: constant movement of water molecules through xylem from roots to leaves
- driven by evaporation of water from leaves
- any affecting rate of evaporation will affect rate of transpiration
- driven by evaporation of water from leaves
- this is the transpiration stream: constant movement of water molecules through xylem from roots to leaves
- as water evaporates from leaf surface, more water is pulled up through the xylem
- stomata - small openings across a leaf surface
- most water vapour lost by plants is lost from leaves
- usually takes place by diffusion through stomata when they are open
- one of the main reason plants need to keep their stomata closed
- reduce transpiration
- one of the main reason plants need to keep their stomata closed
- usually takes place by diffusion through stomata when they are open
- water loss from leaves
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