A) spiral
B) helical
C) scalariform
D) annular
Correct Answer: D
Solution :
The xylem tissue elements, tracheids are; elongated dead cells. Their cell wall inmoderately thick and ligated. It possesses I secondary thickening of any of the following types on the inner surface of cell wall. (i) Annular Ring like bands of thickenings (ii) Spiral Thickenings are in the form to spiral or helical. (iii) Scalariform Thickenings occur in the form of transverse plants.
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