Assertion :Aldosterone is a steroid hormone and is important in the control of sodium and potassium ion concentration in mammals. Reason: It upgrades sodium ion concentration in the ECF by promoting reabsorption of sodium ions from renal tubules and excretion of potassium ions in urine.

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.
Aldosterone is one of the important mineralocorticoids in humans secreted by adrenal cortex. It's main function is to regulate sodium and potassium content of the body. It increases sodium ion concentration in the blood by absorbing sodium ions from renal tubules. It lowers plasma $K^{+}$ concentration.

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