Transport in plants
- Created by: IrishEllie98
- Created on: 11-06-14 18:29
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- Transport In Plants
- Xylem and Phloem
- Specialised Plant Cells
- Both types of tissue are continuous from the root, up the stem and into the leaf
- Form vascular bundles in broad leaved plants
- Xylem cells carry water and minerals from the roots up through the stem, and are therefore involved in Transpiration
- Phloem cells carry food substances such as sugars up and down stems to growing and storage tissues, this is called Translocation
- The xylem cells are vessels. They are dead cells have the lack in living cytoplasm leaves a hollow lumen. Their cellulose walls have extra thickening of lignin, giving great structure and support
- Phloem cells are living and arranged in columns
- Transpiration
- The evaporation and diffusion of water from inside the leaves
- This loss of water helps to create a continuous flow of water from the roots to the leaves for xylem cells
- Root hairs are projections on root hair cells which increases the surface area for more intake of water by osmosis
- Ensures that plants have enough water for:
- cooling by evaporation
- photosynthesis and support from cell's turgor pressure
- Transport of minerals
- The rate of transpiration is increased by:
- an increase in light intensity
- an increase in temperature
- an increase in air movement
- a decrease in humidity
- Leaf structure is adapted to prevent too much water loss, which can cause wilting
- The evaporation and diffusion of water from inside the leaves
- Xylem and Phloem
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