Identify the parts labelled as $A, B, C$ and $D$ in the given diagram of a bacteriophage.

  • A
    $A$. Head$B$. Neck$C$. Collar$D$. Tail
  • B
    $A$. Capsule$B$. Tail$C$. Collar$D$. Pins
  • C
    $A$. Head$B$. Collar$C$. Tail$D$. Plate
  • D
    $A$. Head$B$. Tail$C$. Collar$D$. Prongs

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$T. O.$ Diener discovered a new infectious agent that was smaller than viruses and has the following characteristics:
$(i)$ It causes potato spindle tuber disease.
$(ii)$ It has free $RNA$.
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Identify the infectious agent.

The size of $TMV$ is

Lichens are useful as:

Asexual reproduction in lichens occurs by which of the following?

Assertion $(S)$: Viruses can pass through bacteria-proof filters.
Reason $(R)$: Viruses are extremely small in size.

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