Download Class 8 Science Practice Worksheets
Review targeted academic worksheets with the CBSE Class 8 Science Endocrine System and Adolescence Worksheet Set 02. Built according to official educational standards for the 2026-27 term, these downloadable Class 8 Science resources support effective daily practice and detailed self-evaluation for Chapter 10 Reaching the Age of Adolescence.
Access Chapter 10 Reaching the Age of Adolescence Practice Papers and Solutions
Navigate directly to the solved Science worksheets using the digital viewer below. Each practice set includes detailed step-by-step solutions, allowing students to instantly cross-check their work and identify areas requiring further revision.
A. Check Point and Keywords
1. Fill in the blanks: 1. ____ regulate the growth and development of the body. 2. ____ of the thyroid gland causes hyperthyroidism. 3. The ____ gland is called the master gland. 4. ____ is both an exocrine and an endocrine gland. 5. The testes produce the ____ hormone which controls the development of sex organs.
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Answer: 1. Hormones; 2. Over-secretion (over-activity); 3. Pituitary; 4. The pancreas; 5. testosterone.
Teacher's Note: Use the key term in your answer.
1. Why do boys develop a heavy or hoarse voice whereas girls do not?
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Answer: At puberty, the male hormone testosterone makes the larynx (voice box) grow bigger in boys, so the voice becomes deep. In girls the larynx grows little, so the voice stays high.
Teacher's Note: Give an example if the question allows.
2. What is adolescence? Give some characteristics.
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Answer: Adolescence is the period between childhood and adulthood, from about 13 to 19 years (teenage). Characteristics: a growth spurt, development of the reproductive organs, voice change in boys, beard and moustache in boys, menstruation in girls, pimples and mood swings.
Teacher's Note: Write a short, clear answer.
4. Define: endocrine glands, exocrine glands, hormones, puberty, menarche.
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Answer: Endocrine glands: ductless glands that pour hormones directly into the blood. Exocrine glands: glands that send secretions through ducts. Hormones: chemical messengers made by endocrine glands. Puberty: the stage at which the reproductive organs become mature. Menarche: the first menstrual period in a girl.
Teacher's Note: Remember this for your exam.
B. Exercise
(i) The master gland: (a) thyroid (b) parathyroid (c) pituitary (d) pancreas. (ii) The gland with the islets of Langerhans. (iii) Over-secretion of growth hormone results in. (iv) The emergency hormone. (v) A physical change specific to females.
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Answer: (i) (c) Pituitary; (ii) (b) Pancreas; (iii) (c) Gigantism; (iv) (b) Adrenaline; (v) (a) Menopause.
Teacher's Note: Learn this point and write it in your own words.
6. Fill in the blanks: 1. The ____ gland is responsible for diabetes. 2. Hormones are produced by ____. 3. Teenage is from ____ to ____ years. 4. The ____ gland secretes growth hormone and oxytocin. 5. Pimples are from over-activity of ____ and ____ glands.
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Answer: 1. pancreas; 2. endocrine glands; 3. 13 to 19; 4. pituitary; 5. sebaceous (oil) and sweat.
Teacher's Note: Use the key term in your answer.
7. True or False: 1. Oestrogen is a male hormone. 2. The pituitary is at the base of the brain. 3. The adrenal gland is called the master gland. 4. The end of menstruation is called menopause. 5. Reproductive maturity is called puberty.
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Answer: 1. False (female); 2. True; 3. False (pituitary); 4. True; 5. True.
Teacher's Note: Give an example if the question allows.
8. Complete the table of glands, hormones and functions.
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Answer:
| Gland | Hormone | Function |
|---|---|---|
| Pituitary | Growth hormone, oxytocin and others | Controls growth, and controls other glands; oxytocin helps in childbirth |
| Pancreas | Insulin and glucagon | Controls the blood sugar level |
| Thyroid | Thyroxine | Controls metabolism and growth |
| Adrenal | Adrenaline | Prepares the body for an emergency (fight or flight) |
Teacher's Note: Write a short, clear answer.
C. Short Answers
1. Two examples each of (i) endocrine and (ii) exocrine glands. 2. The location of the thyroid and the pancreas.
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Answer: (i) Pituitary and thyroid. (ii) Salivary glands and sweat glands. The thyroid is in the neck, in front of the windpipe. The pancreas lies behind the stomach, near the small intestine.
Teacher's Note: Remember this for your exam.
3. The formula for the full height of an individual. 4. The period when girls start menstruation. 5. Two changes in adolescence.
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Answer: 3. A rough rule is: adult height = (father's height + mother's height) divided by 2, plus 6.5 cm for boys, or minus 6.5 cm for girls. 4. Menarche. 5. Voice change and a growth spurt (also pimples and growth of hair).
Teacher's Note: Learn this point and write it in your own words.
1. What is adolescence? 2. Secretions of the thyroid and parathyroid. 3. The function of oxytocin in females.
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Answer: 1. The period of change from childhood to adulthood. 2. Thyroid: thyroxine; parathyroid: parathormone, which controls calcium in the blood. 3. Oxytocin makes the uterus contract during childbirth and helps release of milk.
Teacher's Note: Use the key term in your answer.
4. Difference between hyperthyroidism and hypothyroidism. 5. What is a hormone?
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Answer: Hyperthyroidism is over-secretion of thyroxine (weight loss, restlessness, bulging eyes). Hypothyroidism is under-secretion (weight gain, tiredness, goitre in children cretinism). A hormone is a chemical messenger made by an endocrine gland and carried by the blood to a target organ.
Teacher's Note: Give an example if the question allows.
D. Long Answers
1. Which gland regulates the level of glucose? How?
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Answer: The pancreas. When blood sugar is high, its beta cells (islets of Langerhans) release insulin, which makes the liver and the muscles store glucose as glycogen. When sugar is low, glucagon changes the glycogen back to glucose. Lack of insulin causes diabetes.
Teacher's Note: Write a short, clear answer.
2. Location and one function of each endocrine gland.
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Answer:
| Gland | Location | Function |
|---|---|---|
| Pituitary | Base of the brain | Master gland; growth |
| Thyroid | Neck | Controls metabolism |
| Parathyroid | Behind the thyroid | Controls calcium |
| Adrenal | Above the kidneys | Emergency hormone (adrenaline) |
| Pancreas | Behind the stomach | Controls blood sugar |
| Ovaries (female) | Lower abdomen | Oestrogen; female features |
| Testes (male) | Scrotum | Testosterone; male features |
Teacher's Note: Draw the human body with these glands marked.
3. What is the endocrine system? How does it function?
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Answer: It is a system of ductless glands that make hormones. The hormones enter the blood, travel to the target organs and control growth, metabolism, reproduction and the body's response to stress. It works more slowly than the nervous system, but the effects last longer.
Teacher's Note: Learn this point and write it in your own words.
4. Physical and emotional development in adolescents.
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Answer: Physical: fast growth in height and weight, the voice breaks in boys, hair grows on the face, underarms and pubic area, girls begin menstruation and the breasts develop, and the sweat and oil glands become active, causing pimples. Emotional: mood swings, a wish for independence, interest in the opposite sex, and curiosity. Support from family and friends is needed.
Teacher's Note: Use the key term in your answer.
5. The importance of personal hygiene.
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Answer: Hygiene during adolescence is essential because sweat glands become active. Bathe daily, wash hair, keep clothes clean, brush teeth, keep nails short, wash hands, take care of the face for pimples, and girls should follow menstrual hygiene by changing sanitary pads regularly. It prevents infection and builds confidence.
Teacher's Note: Give an example if the question allows.
Free study material for Science
Free CBSE Practice Worksheets: Class 8 Science Chapter 10 Reaching the Age of Adolescence
Practice Exercises for Class 8 Science Chapter 10 Reaching the Age of Adolescence
Access structured practice worksheets for Chapter 10 Reaching the Age of Adolescence aligned with the 2026 CBSE curriculum. These downloadable exercises for Class 8 Science help students build accuracy and reinforce core concepts for upcoming school tests.
Step-by-Step Solutions and Practice Guidelines
Each worksheet draws directly from authorized standard textbooks to maintain academic accuracy. Evaluating your finished exercises against expert-verified solutions helps master the formal presentation standards expected in school evaluations.
Enhance Speed with Online Practice
Consistent engagement with these exercises builds familiarity with recurring exam themes. If specific areas within Chapter 10 Reaching the Age of Adolescence cause trouble, utilize our dedicated NCERT solutions for Class 8 Science to clear up doubts immediately.
FAQs
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