The Living World Question 174

Question: Virusus usually infect the whole plant except the [CBSE PMT 1993; MH CET 2000]

Options:

A) Stem apex

B) Cortex

C) Pith

D) Phloem

Show Answer

Answer:

Correct Answer: A

Solution:

Because in apical tips of shoot apex, a few growth hormones like auxins are formed which check infection of viruses.