Which of the following statements is wrong for viroids?

  • A
    They cause infections.
  • B
    Their $RNA$ is of high molecular weight.
  • C
    They lack a protein coat.
  • D
    They are smaller than viruses.

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It is responsible for potato spindle tuber disease.

Banana bunchy top is caused by

Assertion : $TMV$ is a virus which causes mosaic disease.
Reason : $TMV$ has $RNA$ as genetic material.

Who discovered the virus for the first time?

The genetic material of a virus includes

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