Which of the following contains a helical $RNA$ strand and capsomeres?

  • A
    Polio virus
  • B
    Tobacco mosaic virus
  • C
    Chickenpox virus
  • D
    Retrovirus

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$A$ scientist $X$ demonstrated that the extract of infected plants of $Y$ could cause infection in healthy plants and called the fluid as "Contagium vivum fluidum". Identify $X$ and $Y$.

In which plant is the microorganism shown in the given figure found?

Select the correct statement.

What is the capsid made of?

Which of the following infects bacteria?

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