Antiviral substance is

Antiviral substances are

Why is it difficult to make antiviral substances ?

An antiviral substance produced in response to viral infection for restricting its multiplication is

An antiviral substance produced in response to viral infection for restricting its multiplication is

When a plant/animal is infected with virus, it may produce an antiviral substance that is capable of inhibiting the multiplication of that virus. Identify the correct name of this substance

Ferrimagnetic substance is converted into paramagnetic substance at