Question

Choose the odd statement w.r.t. the causal agent of mosaic disease in tobacco plant.

Only its deoxyribonucleic acid enters inside the host cell

It was the first virus to be crystallised by Stanley

It has single stranded nucleic acid as its genetic material

Its capsomeres are helically arranged to form capsid​

Answer 1

Answer:

I think it is nicotine , Nicotiana tobacum

Answer 2

Answer:

The odd statement with respect to the casual agent of mosaic disease in tobacco plant is, Only its DNA enters inside the host cell.

Explanation:

The mosaic disease in tobacco plant is caused by the infection of the agent, tobacco mosaic virus(TMV). Tobacco mosaic viruses are positive-sense single-stranded RNA viruses in the genus tobamovirus which infect a wide range of plants, especially plants in the family of Solanaceae. Tobacco mosaic virus is the first virus to be crystallized by Stanley.

Since the genetic material of these viruses is RNA, there is no DNA to enter inside the host cell.SO, the first statement is wrong. And since the RNA is single-stranded, the genetic material of TMV is a single-stranded genetic material. The capsid is the outer covering of a protein that protects the genetic material of the virus. Capsomeres, are the subunits that assemble to form capsids.

Therefore, except for the first statement, all others are the correct description for the tobacco mosaic virus.