The genetic material of a virus includes

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(D) Viruses are obligate intracellular parasites that can reproduce only by invading and taking over other cells,as they lack the cellular machinery f

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$RNA$ or $DNA$,i.e.,one nucleic acid in a virus.

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(D) Viruses are obligate intracellular parasites that can reproduce only by invading and taking over other cells,as they lack the cellular machinery for self-reproduction.Viruses contain either $DNA$ or $RNA$ as their genetic material,but never both in the same virus.Viruses having $RNA$ as the genetic material are often referred to as Retroviruses if they possess the enzyme reverse transcriptase.

Column $I$	Column $II$
$(a)$ Potato spindle tuber	$(i)$ Virus
$(b)$ Creutzfeldt-Jakob disease $(CJD)$	$(ii)$ Viroid
$(c)$ Cholera	$(iii)$ Prion
$(d)$ Leaf rolling and curling	$(iv)$ Bacteria

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The potato spindle tuber disease is caused by which of the following?

From which plants did $D.J. Ivanowsky$ discover viruses?

Match the following:
Column $I$ Column $II$
$(a)$ Potato spindle tuber $(i)$ Virus
$(b)$ Creutzfeldt-Jakob disease $(CJD)$ $(ii)$ Viroid
$(c)$ Cholera $(iii)$ Prion
$(d)$ Leaf rolling and curling $(iv)$ Bacteria

Which of the following acts as a pollution indicator?

Give scientific reasons: Lichens are good pollution indicators.

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