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In a mature monocot stem, the disintegration of the lowermost protoxylem produces a structure called the:
ASclerenchyma bundle cap
BParenchyma bundle sheath
CProtoxylem lacuna
DA wide medullary ray
Answer & Solution
Correct answer: C. Protoxylem lacuna
1. In the monocot stem the xylem vessels form a V or Y shape.
2. As the bundle matures, the lowermost protoxylem disintegrates.
3. This breakdown leaves behind a cavity.
4. The cavity is named the protoxylem lacuna.
5. Option A bundle cap is a dicot stem sclerenchyma patch, so it is wrong.
6. Option B bundle sheath is the covering around the whole bundle, the trap.
7. Option D medullary ray is a dicot stem feature, absent in monocot stems.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Internal Structure of Monocot Stem", p.185_
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