(C) Viroids were discovered in $1971$ by $T.O.$ Diener. They cause potato spindle tuber disease. They are smaller in size than viruses. They lack the

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Viroids lack a protein coat and contain free $RNA$ of low molecular weight.

(C) Viroids were discovered in $1971$ by $T.O.$ Diener. They cause potato spindle tuber disease. They are smaller in size than viruses. They lack the protein coat found in viruses and contain free $RNA$ of low molecular weight.

Class 11 Biology Biological Classification Viruses, Viroids, Prions and Lichens

Medium

How are viroids different from viruses?

A
Viroids contain protein coat but lack $RNA$.
B
Viroids are larger than viruses.
C
Viroids lack a protein coat and contain free $RNA$ of low molecular weight.
D
Viroids contain $DNA$ instead of $RNA$.

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Chapter

Biological Classification

Subtopic

Viruses, Viroids, Prions and Lichens

For what is $D.J. Ivanowsky$ famous?

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Viruses are composed of:

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Match the following columns:

Column-$I$ Column-$II$

$1$. Ivanowsky $p$. Discovered viroids.

$2$. Tulasne $q$. Studied algae.

$3$. Diener $r$. Coined the term virus.

$4$. Beijerinck $s$. First to discover lichen.

$t$. Studied mycology.

$u$. First to discover $TMV$.

Column-$I$	Column-$II$
$1$. Ivanowsky	$p$. Discovered viroids.
$2$. Tulasne	$q$. Studied algae.
$3$. Diener	$r$. Coined the term virus.
$4$. Beijerinck	$s$. First to discover lichen.
	$t$. Studied mycology.
	$u$. First to discover $TMV$.