Special epidermal hairs covering stomata in xerophytes
D
Callus secretion on sieve plates
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The correct Answer is:
B
A tylosis is a bladder like distension of parenchyma cell into the lumen of adjacent vessels in wood. Tylosis is used in the xylem of woody plants and prevent from injury or protection from decay in heart wood.
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Assertion : Typloses plug the tracheids and vessels. Reason : Tylosers are in growth of xylem cells.
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Read the following statements about xylem elements. Which ones are true? I. The gymnosperms lack xylem vessels, instead they possess tracheids. II. Xylem parenchyma is involved in upward movement of water. III. Tyloses occurs in xylem fibers.
