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Question

Lignified spindle shaped primitive conducting elements are

A
Tracheids
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B
Vessels
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C
Fibres & Scelereids
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D
Sieve cells
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Solution

The correct option is D Tracheids
Tracheids are spindle-shaped cells with thick and lignified walls and tapering ends. These are dead without protoplasm and are the elements of xylem develop first in pteridophytes that is the reason these are considered as a primitive conducting element.
So the correct option is 'Tracheids'

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