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Given below are assertion and reason. Po...

Given below are assertion and reason. Point out if both are true and reason is correct explanation (A), both are true but reason is not correct explanation (B), assertion is true but reason is wrong (C ) and both are wrong (D). Assertion. Diabetes insipidus is marked by excessive urination and too much thirst. Reason. Antidiuretic hormone is secreted by posterior lobe of pituitary.

A

a

B

b

C

c

D

d

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Evaluate the Assertion The assertion states: "Diabetes insipidus is marked by excessive urination and too much thirst." - **Analysis**: Diabetes insipidus is indeed characterized by excessive urination (polyuria) and excessive thirst (polydipsia). This condition arises due to a deficiency of the antidiuretic hormone (ADH), which leads to the production of dilute urine and increased thirst due to water loss. - **Conclusion**: The assertion is **true**. ### Step 2: Evaluate the Reason The reason states: "Antidiuretic hormone is secreted by the posterior lobe of the pituitary." - **Analysis**: The antidiuretic hormone (ADH), also known as vasopressin, is indeed secreted by the posterior lobe of the pituitary gland. This hormone plays a crucial role in regulating water balance in the body by promoting water reabsorption in the kidneys. - **Conclusion**: The reason is also **true**. ### Step 3: Determine the Relationship Between Assertion and Reason - The assertion explains a condition (diabetes insipidus) that occurs due to a deficiency of ADH. The reason correctly states where ADH is secreted but does not explain why diabetes insipidus occurs. The reason does not provide a direct explanation for the assertion. - **Conclusion**: While both the assertion and reason are true, the reason does not correctly explain the assertion. ### Final Answer Based on the evaluations: - Both the assertion and reason are true, but the reason is not the correct explanation for the assertion. - Therefore, the correct answer is **(B)**: both are true but the reason is not the correct explanation. ---
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