OBJECTIVE LIFE SCIENCE
PLANT PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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CAMBIUM IS ABSENT
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XYLEM IS SURROUNDED ALL AROUND BY PHLOEM
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A BUNDLE SHEATH SURROUNDS EACH BUNDLE
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None of the above
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Detailed explanation-1: -Contrary to dicots, monocotyledonous plants’ vascular bundles do not have a layer of meristematic tissue (cambium). Thus, the vascular bundles of monocots are said to be closed since no new cells can grow inside of them, whereas the vascular bundles of dicot plants can.
Detailed explanation-2: -Vascular bundles in monocotyledons are considered as closed because cambium is absent in the vascular system and thus they lack secondary growth in the thickness. Therefore, the correct answer is option D.
Detailed explanation-3: -Due to the absence of cambium, the vascular bundles in monocots are said to be closed. This absence of cambium in monocots results in no secondary growth and no new cells are formed within the vascular bundles.