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Question

The balloon like outgrowth of parenchyma in the lumen of a vessel is known as

A
Histogen
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B
Tyloses
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C
Phellogen
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D
Tunica
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Solution

The correct option is C Tyloses
Tyloses are the parenchymatous outgrowth from vessel-parenchyma which pairs into the lumen of tracheary elements. These are naturally formed in heartwood and are observed in the xylem of leaves during senescence. Tyloses form in xylem vessels in response to various environmental stimuli.
Thus, the correct answer is option B.

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