Water and minerals are absorbed by the roots and then transported to leaves. How?
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roots absorb these through diffusion and osmosis..they are transported to leaves through vascular bundles (xylem and phloem)
- xylem transport water
- phloem translocate food
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1. Transpiration is the process of removal of water vapors from the aerial parts of a plant, mainly through stomata in the leaves.
2. There are two conducting tissues of plants: first is xylem and second is phloem. Tracheids and vessels which are two kinds of elements of xylem.
3. Tracheids are found in all vascular plants. They are spindle shaped, have only pits and are not very efficient.
4. Vessels are found in flowering plants, are tube like, have perforation plates and pits making them more efficient.
5. When loss of water in vapour occur from leaves of plants due to transpiration, deficit of water is created in the leaves. Evaporation of water molecules from the cells of a leaf creates a suction force which pulls water from the xylem cells.
6. Water and minerals dissolved in it move up to leaves from root through tracheids and vessels, pulling water and minerals upward through xylem elements-ascent of sap. Thus transpiration helps in upward movement of water from roots to leaves.
7. The roots of a plant absorb water and dissolved substances from the soil, which is needed by the aerial parts of the plants. As such these substances are to be transported from roots up to stem, leaves and flowers.
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