Question

Callose plugs are formed during winter

• A. in the end walls of tracheids
• B. on the walls of vessels
• C. on sieve plates
• D. on the walls of sclereids

Answer 1

The correct option is C

on sieve plates

Sieve plate (oblique transverse perforated septa) is present between the two sieve tube elements at their end wall. It is porous. Materials are transported through these pores. Callose deposited on the radius of pores during dropping season (autumn) of leaves, to form a thick layer. This is called Callus pad.