Water Uptake and Loss in Plants (Page 27)
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- Created on: 13-01-15 18:49
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- Water Uptake and Loss in Plants
- Transpiration is caused by the evaporation and diffusion of water from inside the leaves.
- This creates a shortage of water in the leaf and so more water is absorbed from the rest of the plant through the xylem vessels to replace it.
- This in turn means more water is absorbed from the roots and so there is a constant transpiration stream of water through the plant.
- The stomata in the leaves causes evaporation because the concentration of water in the air is less than the concentration of water in the leaves.
- The transpiration stream provides the plant with a constant supply of water for photosynthesis.
- The stomata in the leaves causes evaporation because the concentration of water in the air is less than the concentration of water in the leaves.
- This in turn means more water is absorbed from the roots and so there is a constant transpiration stream of water through the plant.
- This creates a shortage of water in the leaf and so more water is absorbed from the rest of the plant through the xylem vessels to replace it.
- Root hairs absorb water by osmosis. They are adapted to this function:
- Root hair cells are very elongated microscopic hairs which enable a big surface area for absorbing water from the soil.
- There is a higher concentration of water in the soil than inside the plant so the water enters the root hair cell by osmosis.
- Transpiration is caused by the evaporation and diffusion of water from inside the leaves.
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