The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
elongating
widening
differentiating
maturing
Centrifugal or Endarch Development -
Protoxylem is formed near the central axis and metaxylem is formed away from centre (towards periphery).
- wherein
Example stem of angiosperm and gymnosperm.
Vessels or tracheae are made up of a row of cells, placed one above the other, with their intervening walls absent or variously pored. The walls of vessel
are lignified and hard, but not very thick. The cell cavity or the lumen is wide. The thickening may be annular, spiral, scalariform, reticulate and pitted.
Option 1)
elongating
This solution is incorrect
Option 2)
widening
This solution is incorrect
Option 3)
differentiating
This solution is incorrect
Option 4)
maturing
This solution is correct
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