First slide

Secondary Growth

Question

State true (T) or false (F) to the given statements and select the correct option.
(A) All tissue layers exterior to vascular cambium constitute bark.
(B) Phellogen,phellem,and phelloderm are collectively known as periderm.
(C) The peripheral region of secondary xylem is lighter in colour and is known as duramen.
(D) Lenticel is lens shaped opening for gaseous exchange and developed during primary growth of plant body.

Moderate

A

A - T ; B - T ; C - F ; D - T
B

A - T ; B - T ; C - F ; D - F
C

A - F ; B - F ; C - T ; D - T
D

A - F ; B - T ; C - T ; D - F

Solution

All the tissues present outside the vascular cambium together called as bark. Phellem, Phellogen and Phelloderm together called as periderm. Innermost darker region of secondary xylem of tree is called duramen or heart wood. Lenticels are lens shaped openings seen in the cork or secondary plant body useful for exchange of gases.

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