Endocrine System MCQs
Endocrine System MCQs – Class 8 Science
CBSE Board Examination Practice
Class: 8
Subject: Science
Section: Reaching the Age of Adolescence
Topic: Endocrine System MCQs
Subject: Science
Section: Reaching the Age of Adolescence
Topic: Endocrine System MCQs
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 Science examination standard.
1. The endocrine system is made up of:
Answer: B. Glands
Explanation: The endocrine system consists of glands that secrete hormones directly into the bloodstream to regulate body functions.
Explanation: The endocrine system consists of glands that secrete hormones directly into the bloodstream to regulate body functions.
2. Chemical substances secreted by endocrine glands are called:
Answer: B. Hormones
Explanation: Hormones are chemical messengers that travel through blood and control growth, metabolism, and reproduction.
Explanation: Hormones are chemical messengers that travel through blood and control growth, metabolism, and reproduction.
3. The master gland of the endocrine system is:
Answer: B. Pituitary
Explanation: The pituitary controls other endocrine glands by releasing regulatory hormones.
Explanation: The pituitary controls other endocrine glands by releasing regulatory hormones.
4. Thyroxine hormone is secreted by:
Answer: B. Thyroid gland
Explanation: Thyroxine regulates metabolism, growth, and development of the body.
Explanation: Thyroxine regulates metabolism, growth, and development of the body.
5. Iodine deficiency causes:
Answer: B. Goitre
Explanation: Lack of iodine prevents proper thyroxine production, leading to swelling of the neck called goitre.
Explanation: Lack of iodine prevents proper thyroxine production, leading to swelling of the neck called goitre.
6. Insulin is secreted by:
Answer: B. Pancreas
Explanation: Insulin regulates blood sugar levels. Deficiency leads to diabetes.
Explanation: Insulin regulates blood sugar levels. Deficiency leads to diabetes.
7. Hormones reach target organs through:
Answer: B. Bloodstream
Explanation: Endocrine glands are ductless; hormones directly enter blood.
Explanation: Endocrine glands are ductless; hormones directly enter blood.
8. Adrenal glands are located above the:
Answer: B. Kidneys
Explanation: Adrenal glands produce hormones that help the body respond to stress.
Explanation: Adrenal glands produce hormones that help the body respond to stress.
9. Sex hormones are secreted by:
Answer: B. Gonads
Explanation: Testes and ovaries produce testosterone and estrogen respectively.
Explanation: Testes and ovaries produce testosterone and estrogen respectively.
10. Ductless glands are called:
Answer: B. Endocrine glands
Explanation: They release hormones directly into blood without ducts.
Explanation: They release hormones directly into blood without ducts.
11. Gigantism is caused by excess secretion of:
Answer: B. Growth hormone
Explanation: Overproduction in childhood leads to abnormal height increase.
Explanation: Overproduction in childhood leads to abnormal height increase.
12. Dwarfism results from deficiency of:
Answer: A. Growth hormone
Explanation: Low secretion during childhood reduces height growth.
Explanation: Low secretion during childhood reduces height growth.
13. Fight‑or‑flight hormone is:
Answer: B. Adrenaline
Explanation: It prepares the body to face emergencies by increasing heart rate and energy supply.
Explanation: It prepares the body to face emergencies by increasing heart rate and energy supply.
14. Pancreas acts as both endocrine and exocrine gland because:
Answer: A. It secretes enzymes and hormones
Explanation: It releases digestive juices (exocrine) and insulin (endocrine).
Explanation: It releases digestive juices (exocrine) and insulin (endocrine).
15. Endocrine glands secrete hormones in:
Answer: B. Exact required quantity
Explanation: Hormonal balance is essential; excess or deficiency causes disorders.
Explanation: Hormonal balance is essential; excess or deficiency causes disorders.
16. The gland located in the neck is:
Answer: B. Thyroid
Explanation: It regulates metabolism and energy usage.
Explanation: It regulates metabolism and energy usage.
17. Hormonal imbalance during adolescence may affect:
Answer: D. All of these
Explanation: Hormones regulate physical, emotional, and mental development.
Explanation: Hormones regulate physical, emotional, and mental development.
18. Endocrine system works closely with:
Answer: B. Nervous system
Explanation: Together they coordinate body activities and responses.
Explanation: Together they coordinate body activities and responses.
19. Which hormone regulates sugar level?
Answer: B. Insulin
Explanation: It helps cells absorb glucose from blood.
Explanation: It helps cells absorb glucose from blood.
20. The study of hormones is called:
Answer: B. Endocrinology
Explanation: It is the branch of science dealing with endocrine glands and hormones.
Explanation: It is the branch of science dealing with endocrine glands and hormones.
