Assertion :Dragonflies can be used to decrease occurrence of diseases like malaria, dengue, etc. Reason: Baculoviruses are effective in controlling many insects and other arthropods.

If both assertion and reason are true and reason is the correct explanation of assertion.

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If both assertion and reason are true but reason is not the correct explanation of assertion.

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If assertion is true but reason is false.

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If both assertion and reason are false

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Solution

The correct option is B If both assertion and reason are true but reason is not the correct explanation of assertion.
Since Dragonfly eat mosquitoes which spread malaria, dengue, it can be used to decrease occurrence of these disease.
Baculoviruses are insect pathogenic viruses that are used for pest control.
So, the correct option is 'If both assertion and reason are true but reason is not the correct explanation of assertion'

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