Which among the following is/are constituent(s) of primary xylem?

Tracheids

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Protoxylem

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Xylem fibres

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Metaxylem

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Solution

The correct options are
B Protoxylem
D Metaxylem
The xylem formed during the primary growth from procambium of root and shoot apex is known as primary xylem. Primary xylem is made up of protoxylem and metaxylem. The first formed xylem is the protoxylem and then the later formed xylem is called metaxylem.

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