NEET 2009 Biology question

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:

(1)elongatingCorrect
(2)widening
(3)differentiating
(4)maturing

Answer: (1)

Solution

Protoxylem is the first-formed primary xylem. Its vessels and tracheids have annular and spiral secondary thickenings, which are extensible (the walls are thickened only in rings or a helix, leaving much of the wall thin), so these elements can be stretched without breaking. They therefore develop and function while

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Question ID VK-090243