alleryA deficiency of antidiuretic hormone (ADH) reduces water reabsorption in the kidney tubules, producing which disorder?
ADiabetes mellitus
BDiabetes insipidus
CSimple goitre
DTetany cramps
Answer & Solution
Correct answer: B. Diabetes insipidus
1. ADH (vasopressin) increases reabsorption of water in the kidney tubules.
2. With too little ADH, less water is reabsorbed and urine output rises (polyuria).
3. This deficiency disorder is called diabetes insipidus.
4. Diabetes mellitus is from insulin deficiency, goitre from iodine lack, and tetany from low parathormone, so they are ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 16 Plant and Animal Hormones "Vasopressin or Antidiuretic hormone", p.241_
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