NEET Biology Chemical Coordination and Integration MCQs Set 19

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Multiple Choice Questions

Question 1: Toyield more milk, cowis injected with
(a) sorbitol
(b) prolactin
(c) gonadotrophs
(d) stilbesterol
Show Answer & Explanation

Answer: (b) prolactin

Explanation:
1. Prolactin stimulates milk production in the mammary glands, so it is given to cows to increase the milk yield.
2. Oxytocin causes milk ejection.

Teacher's Note:
1. Stilbesterol is an oestrogen-like drug.

Question 2: Treatment with alloxan destroys
(a) stilt cells
(b) -cells of Langerhans
(c) sertoli cells
(d) cells of Leydig
Show Answer & Explanation

Answer: (b) -cells of Langerhans

Explanation:
1. Alloxan destroys the beta cells of the islets of Langerhans, which secrete insulin.
2. This causes hyperglycaemia and glycosuria like diabetes mellitus.

Teacher's Note:
1. Sertoli and Leydig cells are in the testis.

Question 3: Addison's disease result from
(a) hyposecretion of gonads
(b) hyposecretion of adrenal gland
(c) hypertrophy of kidney
(d) hyposecretion of pituitary gland
Show Answer & Explanation

Answer: (b) hyposecretion of adrenal gland

Explanation:
1. Addison's disease is caused by hyposecretion of the adrenal cortex hormones (cortisol and aldosterone).
2. It causes weakness, low blood pressure and darkening of the skin.

Teacher's Note:
1. Hypersecretion gives Cushing's syndrome.

Question 4: The development of adult characteristics in a moulting insect is promoted by
(a) Thyroxine
(b) Ecdysone
(c) Pheromone
(d) None of these
Show Answer & Explanation

Answer: (b) Ecdysone

Explanation:
1. Ecdysone, produced by the prothoracic gland, controls moulting and the change to adult form in insects.
2. Juvenile hormone keeps the larval stage.

Teacher's Note:
1. Thyroxine is a vertebrate hormone.

Question 5: Heartbeat increasesatthetimeofinterviewbecause of
(a) renin
(b) rennin
(c) adrenaline
(d) DiureticADH
Show Answer & Explanation

Answer: (c) adrenaline

Explanation:
1. Adrenaline is released from the adrenal medulla in stress, such as at an interview, and raises the heart rate.
2. Renin acts on angiotensinogen and ADH reduces urine output.

Teacher's Note:
1. Adrenaline prepares the body for fight or flight.

Question 6: Conn’s disease is caused by the over secretion of
(a) ADH
(b) ACTH
(c) Oxytocin
(d) Aldosterone
Show Answer & Explanation

Answer: (d) Aldosterone

Explanation:
1. Conn's syndrome is caused by hypersecretion of aldosterone from the adrenal cortex.
2. It leads to sodium retention and potassium loss.

Teacher's Note:
1. ADH and oxytocin come from the posterior pituitary.

Question 7: Acromegaly is due to hypersecretion of
(a) Insulin
(b) Thyroxine
(c) Growth hormone
(d) None of these
Show Answer & Explanation

Answer: (c) Growth hormone

Explanation:
1. Acromegaly is due to excess growth hormone secreted in adults after the epiphyseal plates have closed.
2. In children the excess causes gigantism.

Teacher's Note:
1. Insulin and thyroxine are not involved.

Question 8: Steroid hormones are similar in structure to
(a) Tryosine
(b) Cholesterol
(c) CoenzymeA
(d) Glycerol
Show Answer & Explanation

Answer: (b) Cholesterol

Explanation:
1. Steroid hormones are derived from cholesterol and have the same ring structure.
2. Tyrosine gives amine hormones like thyroxine.

Teacher's Note:
1. Glycerol and coenzyme A are not steroid precursors.

Question 9: A person passes much urine and drinks much water put his blood glucose level normal. This condition may be the result of
(a) a reduction in insulin secretion from pancreas
(b) a reduction in vasopressin secretion from posterior pituitary
(c) a fall in the glucose concentration in urine
(d) an increase in secretion of glucagon
Show Answer & Explanation

Answer: (b) a reduction in vasopressin secretion from posterior pituitary

Explanation:
1. Excess urine and thirst with normal blood glucose is typical of diabetes insipidus, caused by reduced vasopressin (ADH) from the posterior pituitary.
2. In diabetes mellitus the blood glucose is high.

Teacher's Note:
1. ADH helps water reabsorption in the kidney.

Question 10: The source of somatostatin is same as that of
(a) Thyroxine and calcitonin
(b) Insulin and glucagon
(c) Somatotropin and prolactin
(d) Vasopressin and oxytocin
Show Answer & Explanation

Answer: (b) Insulin and glucagon

Explanation:
1. Somatostatin is secreted by the delta cells of the islets of Langerhans, as are insulin (beta cells) and glucagon (alpha cells).
2. So the source is the pancreas.

Teacher's Note:
1. Thyroxine and calcitonin come from the thyroid.

Free study material for Biology

Chemical Coordination and Integration Objective Questions & Solutions for NEET Biology

About Chemical Coordination and Integration MCQs for NEET Biology

Review structured objective questions for NEET Biology Chemical Coordination and Integration. Built according to official NEET guidelines, these MCQ sets support daily revision and core concept reinforcement.

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FAQs

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