The distinct cavities (lacunae) found in a mature vascular bundle of maize stem are formed due to

Disruption of protoxylem as well as lysis of adjacent xylem parenchyma

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Disruption of protoxylem alone

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Lysis of xylem parenchyma

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Dissolution of common wall between a few meta xylem elements and their consequent coalition

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Solution

The correct option is B Disruption of protoxylem alone
In a completely mature vascular bundle a schizolysigenous cavity is formed by disintegration of protoxylem. These cavities are filled with water.

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Protoxylem is the first formed xylem. If the protoxylem lies next to phloem what kind of arrangement of xylem would you call it?

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