Assertion :Our body secretes adrenaline in intense cold. Reason: Adrenaline raises metabolic rate.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Our body secretes adrenaline in intense cold. Adrenaline is an emergency hormone, whose concentration increases under stress conditions, e.g, cold, stress. Adrenaline is secreted from adrenal medulla.
Adrenaline has many functions. It initiates many bodily responses, including the stimulation of heart action and an increase in blood pressure, metabolic rate and blood glucose concentration. Increase in metabolic rate produces more heat in the body, thereby keeping the body warm in intense cold.
Therefore, the correct answer is option A.

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