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Question

A vascular element "A" is dead, cylindrical, lignified and conduct substances due to a negative pressure created in it due to transpiration pull. A vascular element "B" is living, cylindrical, non lignified, enucleated and conduct substances due to a positive pressure created in it. A & B conducting elements respectively are

A
xylem parenchyma & sieve tubes
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B
xylem vessels & sieve tubes
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C
sieve tubes & xylem tracheids
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D
sieve tubes & xylem vessels
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Solution

The correct option is B xylem vessels & sieve tubes
Xylem vessels are dead cylindrical, lignified and conduct substances due to a negative pressure created in it due to transpiration pull.

Sieve tube is a living, cyclindrical, non lignified and enucleated vascular element. They transport substances due to positive pressure.

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