NEET 2015 Biology question

Vascular bundles in monocotyledons are considered closed because:

(1)Cambium is absentCorrect
(2)There are no vessels with perforations
(3)Xylem is surrounded all around by phloem
(4)A bundle sheath surrounds each bundle

Answer: (1)

Solution

In monocot stems the vascular bundles are conjoint and closed, i.e. they lack cambium between xylem and phloem, so they cannot form secondary tissues (NCERT). Closed bundles are defined by absence of cambium, while dicot bundles are open because

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Question ID VK-091765