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Q.

Why are vascular bundles closed in monocots? 


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a

Xylem and phloem are present

b

Xylem and phloem are in separate bundles

c

Vascular cambium is present between xylem and phloem

d

Vascular cambium is not present 

answer is D.

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Detailed Solution

Concept:Because there is no cambium in the vascular system of monocotyledons, their vascular bundles are thought to be closed and devoid of secondary growth in thickness. Phloem and xylem in monocots are arranged in vascular bundles that are dispersed throughout the stem. Monocot stems produce fresh vascular bundles for the developing tissue as the plant develops.
The vascular bundle in the stem of a monocot is collateral and closed.
Hence, option 4 is the correct answer
 
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