SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following are true of xylem vessels?I. They have no end wallsII. They have pores (pits) in the outer cell wallIII. They contain lignin
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I and II only
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I and III only
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II and III only
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I, II and III
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Explanation:
Detailed explanation-1: -Xylem vessels are wider and usually shorter, do not taper and lack end-plates. The end walls of the vessels break down so that the cells join end to end to form a continuous hollow tube.
Detailed explanation-2: -Xylem is water conducting part. It has tracheids, vessels, xylem parenchyma and xylem fibres. Was this answer helpful?
Detailed explanation-3: -Only living cells of xylem. The cell wall is cellulosic and thin. They have prominent nucleus and protoplast. Cells are colourless and have large vacuoles. Living parenchyma cells are found in both primary and secondary xylem. More items
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