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Transport in plants - Coggle Diagram
Transport in plants
8.2 - Transport of water
Water uptake
Root hair cells help in the absorption of water from the soil. The cytoplasm and cell sap inside the root hair are quite concentrated solutions. Dilute solution on the outside, so the water diffuses into the root hair, down its concentration gradient, through the partially permeable cells
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Transpiration
Transpiration is the loss of water vapour from leaves. This loss takes place from the leaves.
Water is constantly being taken from the top of the xylem vessels to supply the cells in the leaves, as this reduces the effective pressure at the top of the xylem vessels, so the water flows up to them and this pprocess is known as tranpiration stream.
Transpirational pull
A force produced by the loss of water vapour from a leaf, which reduces the pressure at the top of xylem vessels.
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8.1 - Xylem and Phloem
Plant transport systems
The water is absorbed from the roots by the plants. The transport system that does this is made up of a tissue called xylem.
Minerals ions are also transported in xylem.
Second transport system is made up of a tissue is called phloem. Phloem transports sucrose and amino acids from the leaves where they are made, to other parts of the plant such as its roots and flowers.
Xylem
A plant tissue made of dead, empty cells joined end to end; it transport water and mineral ions and helps to support the plant.
Xylem vessels run from the roots of the plants, right up through the stem, they contain no cyctoplasm or nuclei. The walls are made of cellulose and lignin and lignin is a very strong substance that forms the walls of xylem vessels.
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