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Question

Select the mismatched pair out of the following

(A) Radial vascular bundle -Xylem and phloem on different radii
(B) Bicollateral vascular bundle - Phloem present on both sides of xylem
(C) Amphivasal vascular bundle - Phloem surrounds xylem
(D) Conjoint vascular bundle - Xylem and phloem on same radii

A
A
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B
B
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C
C
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D
D
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Solution

The correct option is D C
According to the relative position of xylem and phloem, the vascular bun­dles are classified -
1. Radial: Those in which the xylem and the phloem with different radii lie radically side-by-side (for example, in roots of seed plants). This is the most primitive type.
2. Bi-collateral: Those vascular bundles that contain two patches of phloem on either side of the xylem on the same radius.
3. Amphivasal - Those vascular bundles in which xylem surrounds the phloem tissue from all sides of the vascular bundle.
4. Conjoint - Those in which the two types of tissues are separated from one another. Here xylem and phloem together form a bundle.
Hence, (C) is the mismatched option.

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