MCQs on Endocrine System Class 10 Concise ICSE Biology Selina Solutions Ch-12. In this article you will get the solutions / answer of important MCQs for practice. with hint and reason Assertion and Reason type questions are also given for complete preparation. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.

MCQs on Endocrine System Class 10 Concise ICSE Biology Selina Solutions Ch-12

Board	ICSE
Subject	Biology
Class	10
Book	Selina Concise
Chapter-12	Endocrine System
Topics	Solutions of MCQs Type Questions

MCQs on Endocrine System

Class 10 Concise ICSE Biology Selina Solutions Ch-12

Que-1: Which of the following is not an endocrine gland?

1. Adrenal gland
2. Pituitary gland
3. Thyroid gland
4. Sebaceous gland

Ans: Sebaceous gland
Hint: The sebaceous gland is present in the skin and secretes an oily substance called sebum.

Que-2: Which of the following hormones stimulates milk secretion?

1. Prolactin
2. Oxytocin
3. Progesterone
4. Calcitonin

Ans: Prolactin
Hint:  Prolactin is responsible for formation and secretion of milk.

Que-3: Oxytocin stimulates the contraction of:

1. Ovary
2. Ureter
3. Uterus
4. Breast

Ans: Uterus
Hint: Oxytocin induces uterine contractions during labor.

Que-4: Hypersecretion of growth hormone causes :

1. Gigantism and Dwarfism
2. Acromegaly and Dwarfism
3. Gigantism and Acromegaly
4. Dwarfism and Virilism

Ans: Gigantism and Acromegaly
Hint: Excess growth hormone in childhood leads to gigantism, whereas in adults it causes acromegaly.

Que-5: A gland which secretes enzymes and hormones both is :

1. Adrenal
2. Pancreas
3. Thyroid
4. Pituitary

Ans: Pancreas
Hint: The pancreas produces digestive enzymes and also releases hormones such as insulin and glucagon.

Que-6: Insulin is secreted by :

1. β-cells of Pancreas
2. δ-cells of Pancreas
3. α-cells of Pancreas
4. γ-cells of Pancreas

Ans: β-cells of Pancreas
Hint:   Insulin is produced by the β-cells of the islets of Langerhans in the pancreas.

Que-7: Islets of Langerhans are located in the :

1. Kidneys
2. Liver
3. Throat
4. Pancreas

Ans: Pancreas
Hint:   Islets of Langerhans are small group of cells present in pancreas.

Que-8: Exophthalmic goitre is caused due to the over activity of

1. Thymus
2. Thyroid
3. Parathyroid
4. Adrenal cortex

Ans: Thyroid
Hint:   Too much activity of the thyroid gland causes excess thyroxine, which leads to exophthalmic goitre.

Que-9: The hormone which causes stimulation of sympathetic nervous system is:

1. Thyroxine
2. Insulin
3. Prolactin
4. Adrenaline

Ans: Adrenaline
Hint:   Adrenaline activates the sympathetic nervous system and prepares the body for emergency situations.

Que-10: The hormone which stimulates the breakdown of glycogen in the liver to glucose is:

1. Glucagon
2. Somatostatin
3. Insulin
4. None of these

Ans: Glucagon
Hint:   Glucagon is responsible for breakdown of glycogen in the liver to glucose. It increases the level of glucose in blood.

Que-11: John tried to match the hormones with the disorders caused due to their hyposecretion. He tabulated the pairs as follows:

Hormones	Disorders caused due to hyposecretion
P	Diabetes mellitus
Q	Diabetes insipidus

Identify the correct pairs of hormones.

1. P – Insulin, Q – Vasopressin
2. P – Prolactin, Q – Insulin
3. P – Insulin, Q – Glucagon
4. P – Thyroxine, Q – Adrenaline

Ans: P – Insulin, Q – Vasopressin
Hint:  Insulin controls the blood sugar level, and its deficiency leads to diabetes mellitus. Vasopressin helps the kidneys reabsorb water, and its deficiency results in diabetes insipidus.

Assertion and Reason Type MCQs on Endocrine System with Answer / Solutions

Que-12: 

Assertion. Hormones are the secretions from some glandular parts of the body which regulate certain physiological processes by chemical means.
Reason. Hormones are directly poured into the target organs which are usually very close to the source/gland secreting the hormones.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans: A is True and R is False.
Explain:  Hormones are released directly into the bloodstream, which carries them to their target organs.

Que-13: 

Assertion. Adrenal medulla secretes glucocorticoids which regulate glucose levels of the blood.
Reason. Glucocorticoids, a kind of cortisone, stimulate the deposition of extra glucose in blood as glycogen in the liver and muscles. The roles of insulin and glucocorticoids are the same.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans: Both A and R are False.
Explain:  The adrenal cortex produces glucocorticoids, which help control the blood sugar level by increasing glucose production in the body.

Que-14: 

Assertion. Oversecretion of insulin causes hyperglycemia or diabetes mellitus.
Reason. Oversecretion of insulin can lead to hypoglycemia by causing excessive uptake of glucose from the blood into the cells, which in turn can lead to increased insulin resistance and ultimately result in hyperglycemia or diabetes mellitus.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans: A is False and R is True
Explain: Under-secretion of insulin causes hyperglycemia or diabetes mellitus.

Que-15: 

Assertion. Cretinism is a condition which affects adults causing dwarfism and mental retardation.
Reason. Cretinism is a kind of hypothyroidism. This disease occurs due to the defective development, or early atrophy (degeneration), of the thyroid.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans: A is False and R is True.
Explain: Cretinism is a disorder in children that leads to stunted growth and mental delay. It occurs when the thyroid gland stops functioning in early childhood.

–:  End of MCQs on Endocrine System Class 10 Concise ICSE Biology Selina Solutions :–

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