Question

Callose plugs are formed during winter in _________.

• A. The end walls of tracheids
• B. The walls of vessels
• C. Sieve tube elements
• D. The walls of sclereids

Answer 1

The correct option is C

Sieve tube elements

Callose plugs are formed at the end of sieve tube elements. These plugs are can be dissolved whenever it is not needed and the sieve tubes can start to function once again.