Transgenic Plant
What are the various disadvantages of cross protection?

Possibility of unnecessary spread of mild virus
Possibility of synergism between inducing virus and other unrelated virus
All of these
Possibility of mutations in inducing mild virus strain

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

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
inoculating the susceptible strain with genes of nucleocapsid
inoculating the susceptible strain with the coat proteins of virulent strain

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