Transport in Plants
- Created by: Eleanor Izzard
- Created on: 30-12-12 19:40
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- Transport in Plants
- Vascular Tissues
- In the Stem
- Xylem is found towards the inside of each vascular bundle and phloem towards the outside of the bundle
- vascular bundles are found near the outer edge of the stem
- in woody plants the bundles are separate in young stems and become continuous in older stems
- there is a complete ring just under the bark of the tree - providing strength and flexability
- in non woody plants the bundles are separate and discrete
- in woody plants the bundles are separate in young stems and become continuous in older stems
- Cambium is between the Xylem and Phloem. It is a layer of meristem cells that divide to produce new Xylem and Phloem
- In the young root
- around the vascular bundle is a special sheath of cells called the endodermis - which plays a key role in getting water into the xylem vessels
- Xylem is a large central core, often in an X shape
- inside the endodermis is a layer of meristem cells called the pericycle
- they remain able to divide
- In the Leaf
- a dicotyledon leaf has a branching network of veins that get smaller as they spread away from the midrib. Within each vein, the xylem can be seen on top of the phloem
- vascular bundles from the midrib and veins of a leaf. There are 2 major groups of flowering plants, dicotyledons and monocotyle-dons
- names based on the number of first leaves they have
- In the Stem
- Transport System
- all living things take substances from their environment and return wastes to their environment
- in a large multicellular plant the epithelial cells are close enough to the supply that they can gain all they need by simple diffusion
- many cells are inside the plant that are further from the supply - they would not receive enough water or nutrients to survive
- roots can obtain water easily, but not sugars and leaves can make sugars but cannot obtain water
- Vascular Tissues
- bundles often contain other types of tissues that give the bundle strength and support the plant
- distributed through-out the plant. Xylem and Phloem are found together in vascular bundles
- Vascular Tissues
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