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 vessels 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.
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
NEET UG 2009 — Botany Anatomy of Flowering Plants
2009mcqmedium
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
Official previous-year question
Held on 30 Apr 2009 · Verified 9 Jul 2026.
Options
- A
maturing
- B
elongating
- C
widening
- D
differentiating
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