Question

Assertion :Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Antidiuretic hormone (ADH) is secreted by posterior lobe of pituitary.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Diabetes insipidus is a disorder in which there is less secretion of ADH due to which there is less water reabsorption in kidneys. The water balance in body is disturbed and hence patient feels thirsty because there is water loss. Also, the patient shows excessive urination because kidneys are not able to reabsorb water. Hence, assertion is correct.

Anti diuretic hormone (ADH) or Vasopressin is secreted from the posterior part of pituitary gland. This hormone increases reabsorption of water in kidneys and this results in decreased rate of urine production. Hence, reason is also correct but it is not correct explanation for assertion.

So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.