In monocot stem, each vascular bundle possesses a lacuna which is formed by disintegration of.

Protophloem

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Protoxylem

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Metaphloem

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Metaxylem

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Solution

The correct option is A Protoxylem

The cavity or lacuna formed by the disintegration of protoxylem cells, in the vascular bundles of monocot stem is called protoxylem lacuna. It is a lysigenous cavity, stores water.
So, the correct option is ‘Protoxylem’.

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