Question

functions of TS OF LEAF

Answer 1

The structure of the umbrella tree leaf is typical of leaves in general (Above left photo). It has an outer layer, the epidermis, which produces a waxy waterproof coating. The epidermis of the undersurface produces guard cells, which swell and shrink to close and open the pores (stomata) which control the loss of water vapor (transpiration) and the entry of carbon dioxide. The internal tissues consist of the mesophyll, the photosynthetic cells of the leaf. These are typically the long columnar cells nearer the surface (palisade parenchyma) and the looser irregular cells beneath (the spongy mesophyll parenchyma). These cells are loaded with chloroplasts in the cytoplasm. Each of these cells has a large vacuole, bound by a membrane, which takes up some 90 % of the cell volume. Water and nutrients move into these tissues via the xylem tissue in the veins, and the sugar products of photosynthesis are translocated to other parts of the plant via the phloem tissue. The importance of the movement of carbon dioxide and water into the plant are seen in the summary equation for photosynthesis.
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Answer 2

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