Which of the following is correct about viroids?

  • A
    They have free $DNA$ without protein coat.
  • B
    They have $RNA$ with protein coat.
  • C
    They have free $RNA$ without protein coat.
  • D
    They have $DNA$ with protein coat.

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Viruses possess all the following properties,except

$A$ : Viroids are not included in the five-kingdom system.
$R$ : They are non-cellular.

The infectious agents made up of $RNA$ only are

How many types of lichens are there based on their external morphology (growth form)?

In lichens,the male and female reproductive structures are produced by which of the following?

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