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Question

A mature sieve tube differs from vessel in

A
Being nearly dead
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B
Lacking cytoplasm
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C
Lacking a functional nucleus
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D
Absence of lignified walls
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Solution

The correct option is D Absence of lignified walls
Sieve tube cells do not have lignin in their walls whereas the cell walls of vessels have many secondary thickenings in their walls in the form of lignins.
Therefore, the correct answer is option D.

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