Read the following:a. To know about the causative organismb. To know the mode of transmission of pathogenc. Agro-climatic zone of cultivationd. Genetic constitution of the host plantHow many is/are undertaken before breeding of disease resistant variety?
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a
a and d only
b
a only
c
b and c only
d
a, b, c and d
answer is D.
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Detailed Solution
Three factors - host genotype, pathogen genotype and environment are responsible for development of disease.