Q101. Match the hormones in Column I to their respective physiological effects in Column II
| Column I | Column II |
|---|---|
| (a) Melatonin (b) Oxytocin (c) Prolactin (d) Somatostatin |
(1) Inhibition of growth hormone secretion (2) Synthesis of milk in mammary gland (3) Secretion of milk, uterine contraction (4) Regulation of rhythms from pacemaker acid cells |
Options:
Melatonin regulates circadian rhythms, oxytocin triggers uterine contractions and milk ejection, prolactin promotes milk synthesis in mammary glands, and somatostatin inhibits growth hormone secretion. These matches address the query’s pairing for CSIR NET preparation.
Correct Matching
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(a) Melatonin → (4) Regulation of rhythms from pacemaker acid cells
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(b) Oxytocin → (3) Secretion of milk, uterine contraction
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(c) Prolactin → (2) Synthesis of milk in mammary gland
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(d) Somatostatin → (1) Inhibition of growth hormone secretion
Option (C) 5 → 1; 2 → 3; 4 matches partially but uses unclear numbering; the standard is a-4, b-3, c-2, d-1.
Option Analysis
Options appear misprinted, but assuming (a)=5? standard a-4 etc.
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(A) 5 → 4; 3 → 1: Wrong; mixes melatonin to wrong rhythm, ignores others.
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(B) 3 → 5; 4 → 2; 1: Incomplete/wrong pairings.
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(C) 5 → 1; 2 → 3; 4: Partial; somatostatin(5?)-GH inhibit(1), oxytocin(2)-milk sec(3), prolactin(4?)-? but fits if renumbered.
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(D) 5 → 3; 4 → 2; 1: Wrong; assigns oxytocin to prolactin effect.
Correct is C if Column I labeled 5=a etc., else a4 b3 c2 d1. [-36]
Hormone Functions
Melatonin from pineal gland signals darkness to suprachiasmatic nucleus (SCN, circadian pacemaker), regulating sleep-wake rhythms; “pacemaker acid cells” likely refers to SCN or gastric pacemaker cells with rhythm regulation. Oxytocin contracts uterus during labor and myoepithelial cells for milk let-down (secretion). Prolactin induces alveolar cells to synthesize milk proteins/lactose. Somatostatin from hypothalamus/pancreas inhibits GH release from pituitary.
Melatonin, oxytocin, prolactin, and somatostatin play key roles in physiological regulation, crucial for CSIR NET Life Sciences. This SEO-optimized guide solves matching question Q101 with functions, explanations, and option breakdowns for exam success. Keywords: CSIR NET hormones match, melatonin physiological effects, prolactin milk synthesis.
Detailed Explanations
Melatonin: Synchronizes circadian rhythms via SCN pacemaker; regulates sleep, possibly gastric rhythms. Matches (4).
Oxytocin: Posterior pituitary hormone for parturition (uterine contraction) and milk ejection. Matches (3).
Prolactin: Anterior pituitary; stimulates mammary gland milk protein/lactose synthesis. Matches (2).
Somatostatin: Inhibits GH secretion; matches (1).
Why This Matters for CSIR NET
Mastering hormone-effect matches tests endocrinology depth for competitive exams. Practice similar questions on pituitary/pineal functions.
