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Question

A structure absent in monocot is


A
Sieve tubes
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B
Stomata
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C
Cambium
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D
Vessels
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Solution

The correct option is C Cambium
In monocot stem, epidermis, hypodermis, ground tissue, and vascular bundles are present. General cortex, endodermis, pericycle, medulla, medullary are absent. In the phloem, phloem parenchyma is also absent. Xylem and phloem are present on same radii, and also present side by side. So they are also called Collateral and Conjoint vascular bundles. In the vascular bundles, cambium is absent between xylem and phloem, So these are closed vascular bundles. In the xylem, protoxylem is towards the centre, and metaxylem is towards the periphery. So, it is an endarch xylem. 
So, the correct option is 'Pith or cambium'.

Biology

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