Hormones MCQs for Class 8 Science
Hormones MCQs – Class 8 Science
CBSE Board Examination Practice
Class: 8
Subject: Science
Section: Reaching the Age of Adolescence
Topic: Hormones MCQs
Subject: Science
Section: Reaching the Age of Adolescence
Topic: Hormones 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. Hormones are chemical substances secreted by:
Answer: B. Endocrine glands
Explanation: Endocrine glands release hormones directly into the bloodstream to regulate body functions.
Explanation: Endocrine glands release hormones directly into the bloodstream to regulate body functions.
2. Hormones act as:
Answer: B. Chemical messengers
Explanation: They carry signals from glands to target organs to coordinate body activities.
Explanation: They carry signals from glands to target organs to coordinate body activities.
3. The hormone controlling growth is:
Answer: B. Growth hormone
Explanation: Secreted by the pituitary gland, it regulates height and body development.
Explanation: Secreted by the pituitary gland, it regulates height and body development.
4. Testosterone is produced in:
Answer: B. Testes
Explanation: It develops male secondary sexual characters like facial hair and deep voice.
Explanation: It develops male secondary sexual characters like facial hair and deep voice.
5. Estrogen is responsible for:
Answer: B. Female traits
Explanation: It regulates breast development and menstrual cycle.
Explanation: It regulates breast development and menstrual cycle.
6. Hormones travel through:
Answer: B. Blood
Explanation: Blood transports hormones to target organs.
Explanation: Blood transports hormones to target organs.
7. Insulin regulates:
Answer: B. Blood sugar
Explanation: It helps cells absorb glucose.
Explanation: It helps cells absorb glucose.
8. Thyroxine controls:
Answer: A. Metabolism
Explanation: It regulates energy use and body growth.
Explanation: It regulates energy use and body growth.
9. Adrenaline prepares the body for:
Answer: B. Emergency
Explanation: It triggers fight‑or‑flight response.
Explanation: It triggers fight‑or‑flight response.
10. Pituitary gland is called master gland because it:
Answer: B. Controls other glands
Explanation: It regulates hormone secretion of other glands.
Explanation: It regulates hormone secretion of other glands.
11. Hormonal imbalance may cause:
Answer: A. Disorders
Explanation: Excess or deficiency leads to diseases.
Explanation: Excess or deficiency leads to diseases.
12. Gigantism occurs due to excess:
Answer: B. Growth hormone
Explanation: Causes abnormal height increase.
Explanation: Causes abnormal height increase.
13. Dwarfism is due to deficiency of:
Answer: A. Growth hormone
Explanation: Leads to stunted growth.
Explanation: Leads to stunted growth.
14. Sex hormones are secreted during:
Answer: B. Puberty
Explanation: They initiate reproductive maturity.
Explanation: They initiate reproductive maturity.
15. Hormones act on specific:
Answer: A. Target organs
Explanation: Each hormone affects specific tissues.
Explanation: Each hormone affects specific tissues.
16. Hormones are required in:
Answer: B. Small amounts
Explanation: Even tiny quantities have major effects.
Explanation: Even tiny quantities have major effects.
17. Iodine is needed for production of:
Answer: B. Thyroxine
Explanation: Iodine deficiency affects thyroid function.
Explanation: Iodine deficiency affects thyroid function.
18. Hormones regulate:
Answer: D. All of these
Explanation: Hormones control multiple body processes.
Explanation: Hormones control multiple body processes.
19. Chemical coordination in body is done by:
Answer: A. Hormones
Explanation: Hormones coordinate body activities chemically.
Explanation: Hormones coordinate body activities chemically.
20. Study of hormones is known as:
Answer: B. Endocrinology
Explanation: It deals with endocrine glands and hormones.
Explanation: It deals with endocrine glands and hormones.
