Exchange in plants
- Created by: siobhan
- Created on: 05-05-13 12:32
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- Exchange in plants
- Gases diffuse in and out of leaves through tiny holes called stomata
- The size of the stomata is controlled by the guard cells which surround them
- These gases are
- Oxygen- needed for respiration and is a waste product of photsynethesis
- Carbon dioxide- needed for photosynthesis and is a waste product of respiration
- the movement of these gases depends upon which process is happening the most quickly
- Oxygen- needed for respiration and is a waste product of photsynethesis
- the movement of these gases depends upon which process is happening the most quickly
- Plants also lose water vapour through the stomata due to evaporation in the leaves
- Leaves are flat and very thin so the gases do not need to diffuse very far. There are also internal air spaces
- Water and mineral ions are taken up by the roots. Root hair cells increase the surface area of roots for the absorption of water and mineral ions
- If plants lose water faster than it is replaced by the roots, the stomata can close to prevent wilting
- Gases diffuse in and out of leaves through tiny holes called stomata
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