The Endocrine System assertion reason questions for Class 10 ICSE
1.) Assertion (A): The hormone cortisol, produced by the adrenal glands, is involved in the body’s response to stress and regulates metabolism.
Reason (R): Cortisol is commonly known as the “fight or flight” hormone.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
2.) Assertion (A): The pancreas releases glucagon to increase blood sugar levels.
Reason (R): Glucagon promotes the conversion of glycogen to glucose in the liver.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
3.) Assertion (A): The hormone aldosterone, produced by the adrenal glands, plays a key role in regulating electrolyte balance and blood pressure.
Reason (R): Aldosterone stimulates the reabsorption of sodium and water in the kidneys.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
4.) Assertion (A): Growth hormone (GH) stimulates the growth of bones and tissues in the body.
Reason (R): The pituitary gland releases insulin to regulate blood sugar levels.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (c) A is True and R is False
5.) Assertion (A): The hormone progesterone is primarily produced by the ovaries and plays a role in the menstrual cycle and pregnancy.
Reason (R): Progesterone inhibits the thickening of the uterine lining.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
6.) Assertion (A): The hormone melatonin, produced by the pineal gland, is involved in the regulation of circadian rhythms and sleep-wake cycles.
Reason (R): Melatonin is released in response to exposure to bright light.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
7.) Assertion (A): The hormone insulin, produced by the pancreas, facilitates the uptake of glucose by cells and lowers blood sugar levels.
Reason (R): Insulin promotes the conversion of glycogen to glucose in the liver.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
8.) Assertion (A): Parathyroid hormone (PTH) is released by the parathyroid glands to regulate calcium levels in the blood.
Reason (R): PTH stimulates the release of calcium from bones into the bloodstream.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
9.) Assertion (A): The hormone estrogen, produced by the ovaries, plays a key role in the development of secondary sexual characteristics in females.
Reason (R): Estrogen stimulates the production of sperm in males.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
10.) Assertion (A): Antidiuretic hormone (ADH), produced by the hypothalamus and released by the pituitary gland, regulates water balance in the body.
Reason (R): ADH promotes the excretion of water by the kidneys.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
11.) Assertion (A): The hormone adrenaline, released by the adrenal glands, prepares the body for the “fight or flight” response.
Reason (R): Adrenaline increases heart rate and redirects blood flow to vital organs.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
12.) Assertion (A): Calcitonin, produced by the thyroid gland, helps regulate calcium levels in the blood.
Reason (R): Calcitonin stimulates the release of calcium from bones into the bloodstream.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
13.) Assertion (A): The hormone prolactin, released by the pituitary gland, stimulates milk production in mammary glands.
Reason (R): Prolactin is an inhibitory hormone.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
14.) Assertion (A): The hormone thymosin, produced by the thymus gland, plays a role in the maturation of T lymphocytes.
Reason (R): Thymosin stimulates the release of insulin.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (c) A is True and R is False
15.) Assertion (A): The hormone ghrelin is produced by the stomach and signals hunger to the brain.
Reason (R): Ghrelin stimulates the release of insulin.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
16.) Assertion (A): Cortisol, produced by the adrenal glands, has anti-inflammatory effects in the body.
Reason (R): Cortisol is often used as a treatment for allergies.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
17.) Assertion (A): The hormone aldosterone, produced by the adrenal glands, promotes the excretion of potassium by the kidneys.
Reason (R): Aldosterone stimulates the reabsorption of sodium and water in the kidneys.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
18.) Assertion (A): The hormone leptin, produced by adipose tissue, signals satiety to the brain.
Reason (R): Leptin stimulates appetite.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (c) A is True and R is False
19.) Assertion (A): The hormone oxytocin is involved in social bonding and attachment.
Reason (R): Oxytocin is released during stress.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
20.) Assertion (A): The hormone somatostatin inhibits the release of growth hormone (GH) from the pituitary gland.
Reason (R): Somatostatin promotes the release of insulin.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
21.) Assertion (A): Aldosterone, produced by the adrenal glands, regulates the balance of salt and water in the body.
Reason (R): Aldosterone inhibits the reabsorption of sodium in the kidneys.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
22.) Assertion (A): The hormone testosterone, produced by the testes, is responsible for the development of male secondary sexual characteristics.
Reason (R): Testosterone stimulates the release of estrogen in females.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (c) A is True and R is False
23.) Assertion (A): The hormone serotonin is primarily produced by the adrenal glands and regulates mood and appetite.
Reason (R): Serotonin is a neurotransmitter that acts within the brain.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
24.) Assertion (A): The hormone adrenaline, released during the “fight or flight” response, increases blood flow to the digestive organs.
Reason (R): Adrenaline promotes relaxation of the smooth muscles in the digestive tract.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
25.) Assertion (A): The hormone cortisol, released in response to stress, suppresses the immune system.
Reason (R): Cortisol enhances the immune response.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
26.) Assertion (A): The hormone prolactin is primarily involved in milk production in mammary glands.
Reason (R): Prolactin stimulates the release of estrogen.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
- Assertion (A): The hormone insulin promotes the conversion of glucose to glycogen in the liver.
Reason (R): Insulin stimulates the breakdown of glycogen into glucose.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
28.) Assertion (A): The hormone glucagon stimulates the breakdown of glycogen into glucose in the liver.
Reason (R): Glucagon promotes the conversion of glucose to glycogen.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
29.) Assertion (A): The hormone melatonin, released by the pineal gland, is involved in the regulation of the sleep-wake cycle.
Reason (R): Melatonin is released in response to exposure to darkness.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
30.) Assertion (A): The hormone estrogen, produced by the ovaries, plays a role in the development of female secondary sexual characteristics.
Reason (R): Estrogen inhibits the release of testosterone.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (c) A is True and R is False
31.) Assertion (A): The hormone human chorionic gonadotropin (hCG) is produced by the placenta during pregnancy.
Reason (R): hCG stimulates the release of insulin.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
32.) Assertion (A): The hormone thyroxine, produced by the thyroid gland, plays a crucial role in regulating the body’s metabolic rate.
Reason (R): Thyroxine is a steroid hormone.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
33.) Assertion (A): The hormone ghrelin, produced by the stomach, stimulates appetite.
Reason (R): Ghrelin inhibits the release of insulin.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True
34.) Assertion (A): The hormone leptin, released by adipose tissue, signals satiety to the brain.
Reason (R): Leptin stimulates appetite.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (b) Both A and R are True
35.) Assertion (A): The hormone prolactin plays a role in lactation by promoting milk ejection.
Reason (R): Prolactin inhibits the production of milk in mammary glands.
(a) A is False and R is True
(b) Both A and R are True
(c) A is True and R is False
(d) Both A and R are False
Answer:- (a) A is False and R is True