When does the lignification of xylem vessels in protoxylem happen?

maturing

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elongating

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widening

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differentiating

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Solution

The correct option is B
elongating

In protoxylem, the lignification of xylem vessels happens before the elongation of the stem and the root gets over. This is exactly opposite to metaxylem where the lignification does not happen until the elongation is completed.

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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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