The viruses responsible for causing polio and | vedclass

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(A) Viruses are classified based on the type of tissue they primarily infect. $1$. Neurotropic viruses are those that have an affinity for the nervous

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Neurotropic

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(A) Viruses are classified based on the type of tissue they primarily infect. $1$. Neurotropic viruses are those that have an affinity for the nervous system. $2$. The poliovirus causes poliomyelitis,which affects the central nervous system,and the rabies virus (causing hydrophobia) also targets the nervous system. $3$. Therefore,both are classified as neurotropic viruses.

Column-$I$ (Virus)	Column-$II$ (Type of Genetic Material)
$P$. Animal virus	$I$. $ssRNA$
$Q$. Plant virus	$II$. $dsRNA$ or $dsDNA$ or $ssRNA$
$R$. Bacterial virus	$III$. $dsDNA$

The viruses responsible for causing polio and hydrophobia are

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Give scientific reasons: Lichens are an example of symbiosis.

Give scientific reasons: Lichens are good pollution indicators.

Match the following columns:

Column-$I$ (Virus) Column-$II$ (Type of Genetic Material)

$P$. Animal virus $I$. $ssRNA$

$Q$. Plant virus $II$. $dsRNA$ or $dsDNA$ or $ssRNA$

$R$. Bacterial virus $III$. $dsDNA$

Host specificity is a:

Which of the following organisms contains only one type of genetic material,either $DNA$ or $RNA$?

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