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T.S of leaf |
| Answer» A transverse section of typical leaf shows that it is covered by epidermis on both surfaces. Epidermis is interrepted by large number of openings called stomata. The central opening is called stoma. Each stoma is surrounded two kidney shaped cells called Guard cells. Stoma regulate the exchage of gases and loss of water vapour from the leaves. Tissues enclosed between the two epidermal layers is called the mesophyll. Mesophyll consists of elongated cells arranged in rows called the palisade parenchyma. It also has irregularly arranged cells with large intercellular spaces known as spongy parenchyma. The mesophyll cell contain abundant chloroplasts. More palisade tissue occurs in leaves exposed to bright light that those exposed to shade. Vascular bundles in the leaf are located in the midrib and the veins. In each vascular bundle of the leaf, phloem is located towards the lower side and xylem towards upper side. | |