AIPMT MAINS2009Botany-Plant Anatomy
AIPMT MAINS 2009 Botany Xylem Structure MCQ Question
Type: MCQ-conceptual-Medium-Class 11
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:
A
elongating
B
widening
C
differentiating
D
maturing
Correct Answer
Option D
Detailed Explanation
Annular and spiral thickenings are characteristic of protoxylem, which develops during the elongation phase of the plant. As the plant matures, these thickenings provide flexibility and support.
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