NEET Biology Chemical Coordination and Integration MCQs Set 09

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Chapter-wise Objective Questions: Chemical Coordination and Integration

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Multiple Choice Questions

Question 1: Identify the hormone with its correct source and function.
(a) Oxytocin - posterior pituitary - growth and maintenance of mammary glands
(b) Melatonin - pineal gland - regulates the normal rhythm of the sleep-wake cycle
(c) Progesterone - corpus luteum - stimulates growth and activities of all female secondary sex organs
(d) Atrial natriuretic factor - ventricular wall - increases blood pressure
Show Answer & Explanation

Answer: (b) Melatonin - pineal gland - regulates the normal rhythm of the sleep-wake cycle

Explanation:
1. Melatonin from the pineal gland regulates the sleep-wake cycle and body rhythms.
2. Oxytocin acts on uterine and mammary smooth muscle, progesterone supports pregnancy and ANF comes from the atrial wall and lowers blood pressure.

Question 2: How many organised endocrine glands are present in this list? Pituitary, thymus, gonads, pineal, heart, liver, kidney, parathyroid.
(a) Three
(b) Four
(c) Five
(d) Six
Show Answer & Explanation

Answer: (c) Five

Explanation:
1. Pituitary, pineal, thymus, parathyroid and gonads are organised endocrine glands.
2. Heart, liver and kidney make some hormones but are not primarily endocrine glands.

Question 3: Find the correct row(s). (i) PTH - parathyroid - stimulates bone resorption. (ii) Gonadotrophins - testis or ovary - spermatogenesis or folliculogenesis. (iii) CCK - GIT - secretion of pancreatic enzymes and bile juice.
(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (ii)
Show Answer & Explanation

Answer: (b) (i) and (iii)

Explanation:
1. PTH from the parathyroid raises blood calcium by bone resorption, and CCK from the gut stimulates pancreatic enzymes and bile release.
2. Gonadotrophins are made by the anterior pituitary, not by the gonads.

Question 4: How many of these hormones are peptide, polypeptide or protein hormones? Estradiol, insulin, cortisol, glucagon, progesterone, testosterone.
(a) 6
(b) 4
(c) 1
(d) 2
Show Answer & Explanation

Answer: (d) 2

Explanation:
1. Insulin and glucagon are peptide hormones. Estradiol, cortisol, progesterone and testosterone are steroids.

Question 5: Match the gland with its disorder: (A) adrenal, (B) pancreas, (C) pituitary, (D) thyroid with (I) Graves disease, (II) diabetes insipidus, (III) acromegaly, (IV) Addison disease, (V) diabetes mellitus.
(a) A-III, B-V, C-IV, D-I
(b) A-IV, B-II, C-III, D-I
(c) A-IV, B-V, C-III, D-I
(d) A-I, B-II, C-IV, D-III
Show Answer & Explanation

Answer: (c) A-IV, B-V, C-III, D-I

Explanation:
1. Addison disease is adrenal cortex deficiency, diabetes mellitus is insulin deficiency (pancreas), acromegaly is excess growth hormone (pituitary) and Graves disease is hyperthyroidism.

Question 6: Diabetes insipidus occurs due to hyposecretion of
(a) Insulin
(b) Glucagon
(c) MSH
(d) ADH
Show Answer & Explanation

Answer: (d) ADH

Explanation:
1. Low ADH (vasopressin) prevents water reabsorption in the kidney tubules, causing a large volume of dilute urine.

Question 7: Which of the following is not a function of glucocorticoids?
(a) Gluconeogenesis
(b) Glycogenesis
(c) Lipolysis
(d) Proteolysis
Show Answer & Explanation

Answer: (b) Glycogenesis

Explanation:
1. Cortisol raises blood glucose by gluconeogenesis, with lipolysis and proteolysis supplying the raw materials. It does not promote glycogen synthesis as a main function.

Question 8: Which of the following statements is correct?
(a) In an adult woman, hypothyroidism may cause an irregular menstrual cycle
(b) Hyperthyroidism may result from thyroid cancer or nodules in the thyroid gland
(c) Deficiency of iodine in the diet results in hypothyroidism
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. All three statements are given in NCERT. Iodine deficiency also causes goitre.

Question 9: Which hormone stimulates the secretion of HCl and pepsinogen?
(a) Secretin
(b) Cholecystokinin
(c) Gastric inhibitory peptide
(d) Gastrin
Show Answer & Explanation

Answer: (d) Gastrin

Explanation:
1. Gastrin from the stomach lining acts on gastric glands to release HCl and pepsinogen.

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Multiple Choice Questions (MCQs) for NEET Biology Chemical Coordination and Integration

About Chemical Coordination and Integration MCQs for NEET Biology

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FAQs

Where can I access latest NEET Biology Chemical Coordination and Integration MCQs Set 09?

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Are Assertion-Reasoning and Case-Study MCQs included in the Biology NEET material?

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