Transgenic Plant
Cross protection against viruses in transgenic plants can be obtained by

inoculating the susceptible strain with genes of nucleocapsid
inoculating the susceptible strain with the coat proteins of virulent strain
inoculating the susceptible strain of a crop with a mild strain of a virus that helps in developing resistance against more virulent strain
any of the above

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Transgenic Plant
In transgenic plants that have been manipulated to express patho-genesis-related (PR) proteins all the time it has been shown that

these proteins trigger the production of other antimicrobial defenses
these provide no protection at all against pathogens
expression of one PR protein provides high levels of protection against many pathogens
expression of two PR proteins provides some protection against a few pathogens

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Transgenic Plant
Which of the following has been widely used to provide resistance against plant viruses?

Expression of virus coat protein genes in transgenic plants
Expression of ribonuclease (RNase) genes in host plants
Virus resistance genes from bacteria
Expression of anti-virus genes in vectors that transmit viruses

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