First slide

The Tissues

Question

The components of xylem with various patterns of secondary wall thickenings are seen in
I. Tracheids II. Vessels III. Xylem parenchyma IV. Xylem fibers

Easy

A

I, II
B

II, III
C

III,IV
D

I, IV

Solution

Only the main conducting elements of xylem such as tracheids and vessels have different types of secondary wall thickenings such as annular, spiral, scalariform, reticulate and pitted thickenings. Other components do not have such patterns of secondary wall thickenings.

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