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Question
Assertion :The term 'cross-protection' is used specifically for the protection of a plant by preinfecting the host with a mild strain of the pathogens. Reason: Breakdown of resistant genes in plants is responsible for the occurrence of disease in a previously resistant variety of a crop.
Assertion :The term 'cross-protection' is used specifically for the protection of a plant by preinfecting the host with a mild strain of the pathogens. Reason: Breakdown of resistant genes in plants is responsible for the occurrence of disease in a previously resistant variety of a crop.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Cross-protection in plants is considered to be natural phenomena in plants where the resistance of a plant to one virus strain is induced by the infection of a second one. Resistant genes or R-genes are plant genomes that provide resistance to plant pathogens by producing R-proteins. While the breakdown of these genes may be responsible for the pathogens being able to infect a plant, cross protection is not related to the breakdown of resistant genes. Thus, the correct answer is option B.
Cross-protection in plants is considered to be natural phenomena in plants where the resistance of a plant to one virus strain is induced by the infection of a second one. Resistant genes or R-genes are plant genomes that provide resistance to plant pathogens by producing R-proteins. While the breakdown of these genes may be responsible for the pathogens being able to infect a plant, cross protection is not related to the breakdown of resistant genes. Thus, the correct answer is option B.
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