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Question

When phloem is completely surrounded by xylem, the vascular bundle is called

A
Concentric leptocentric/amphivasal
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B
Concentric hadrocentric/amphicribal
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C
Conjoint collateral
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D
Conjoint bicollateral
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Solution

The correct option is A Concentric leptocentric/amphivasal
In Concentric bundle xylem either encircles or is encircled by phloem and accordingly the following two types are recognized: 1) Concentric leptocentric/amphivasal 2) Concentric hadrocentric/amphicribal
Amphivasal bundle is a vascular bundle in which xylem encircles the central strand of phloem is known as amphivasal bundle, also called leptocentric bundle. Ex. Dracaena, Yucca.
So, the correct answer is 'Concentric leptocentric/amphivasal.'

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