Briefly describe the types of xylem.

1.	Briefly describe the types of xylem.
Answer» Depending upon the time of origin and internal structure, the xylem is of two types: (i) Protoxylem: It is first or easily formed xylem. It is made up of small tracheids and vessels, with annular or spiral thickenings. (ii) Metaxylem: It is later formed xylem. It consist of larger tracheids and vessels and have reticulate, scalariform and pitted thickenings.

Answer»

Depending upon the time of origin and internal structure, the xylem is of two types:

(i) Protoxylem: It is first or easily formed xylem. It is made up of small tracheids and vessels, with annular or spiral thickenings.

(ii) Metaxylem: It is later formed xylem. It consist of larger tracheids and vessels and have reticulate, scalariform and pitted thickenings.

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