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  4. Assertion (A) Vascular bundles in monocots are considered closed. Reason (R) A bundle sheath surrounds each vascular bundle in monocots.

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Q. Assertion (A) Vascular bundles in monocots are considered closed.
Reason (R) A bundle sheath surrounds each vascular bundle in monocots.

Anatomy of Flowering Plants

Solution:

Assertion is true, but Reason is false. Reason can be corrected as
Bundle sheath surrounds only vascular bundles of monocot leaf not in root and stem. The vascular bundles containing cambium are said to be open, but if no cambium develops, they are referred to as closed. In monocots, closed vascular bundles are found because of the absence of cambium.