Home
Class 11
BIOLOGY
Viruses usually infect the whole plant e...

Viruses usually infect the whole plant except the

A

Stem apex

B

Cortex

C

Pith

D

Phloem

Text Solution

Verified by Experts

The correct Answer is:
A
The symptoms of viral diseases usually are systemic rather than localized because the virus spreads through out the plant in the phloem and from cell to cell through Plasmodesmata. In apical tips of shoot apex, a few growth hormones like auxins are formed which check infection of viruses.
Promotional Banner

Similar Questions

Explore conceptually related problems

[A] : Viruses usually have only one nucleic acid either DNA or RNA . [R] : Small viruses can be crystallized .

Filarial worms usually infect the lymphatic vessels of lower limbs and the disease is called …………………………….. .

Viruses that infect the bacteria are termed as

Viruses that infect bacteria, multiply and cause their lysis, are called

Which of the following group of viruses infect the respiratory passage but not the lungs ?

Viruses are small infective particles which are primarily made up of

Viruses are small infective particles which are primarily made up of

The cell cycle of a somatic cell usually consist of the following except

Study the following statements and identify the correct option given below. I. Viruses that infect plants have single stranded RNA and viruses that infect animals have either single or double stranded RNA or double stranded DNA. II. Bacterial viruses or bacteriophages are usually single stranded RNA viruses.