First slide

Secondary Growth

Question

Which of the following is living in nature?

Easy

A

Tracheid
B

Vessels
C

Phellogen
D

Phloem fibres

Solution

Phellogen is another name for cork cambium which is a meristematic tissue and therefore living in nature.
Tracheid and vessels are components of xylem and are dead in nature in order to facilitate the transport of water and minerals from roots to leaves.
Phloem fibres is the only dead component of phloem tissue.

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