Reaching the Age of Adolescence — Class 8 MCQs with Answers
Class 8 CBSE Science · Chapter 107
Pre-2026 syllabusThis chapter is from the older NCERT book. See the 2026-27 Class 8 Science chapters →
72 practice questions · 24 Easy · 24 Medium · 24 Hard · Updated
Practise the most important Class 8 CBSE Science questions from Chapter 107, "Reaching the Age of Adolescence". You get 6 timed quizzes made from 72 NCERT-based MCQs, with answers and explanations. The questions are split into 24 Easy, 24 Medium and 24 Hard. Warm up on the basics, then move on to the exam-level questions that set top scorers in CBSE Board exams apart.
To score well in "Reaching the Age of Adolescence", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This trains you to stay accurate under time pressure, as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Reaching the Age of Adolescence, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 8 Science mastery score. 14 sample questions are solved in full below, with the answer and a worked explanation. Sign in free to start practising.
Key concepts: Reaching the Age of Adolescence (Class 8 Science)
This chapter covers adolescence and puberty — the physical and hormonal changes, the role of hormones, and reproductive health.
- Adolescence & puberty
- Adolescence is the period of growth from about 11 to 18/19 years; puberty brings the ability to reproduce.
- Changes at puberty
- Increase in height, body shape change, voice change, and development of secondary sexual characters.
- Role of hormones
- Endocrine glands secrete hormones into the blood; testosterone (males) and estrogen (females) drive puberty changes.
- Sex determination
- Chromosomes from the father determine the sex of the child (XX → girl, XY → boy).
Reaching the Age of Adolescence — important questions & MCQs with answers (Class 8 Science)
14 solved questions from this chapter's difficulty levels, each with its answer and explanation. The other 58 are timed and scored when you sign in.
- Q1Easy
The period of life between about 11 and 19 years of age is called:
A.InfancyB.Old ageC.ChildhoodD.Adolescence✓ CorrectAnswer: D. Adolescence
Explanation: Adolescence is the stage from about 11 to 19 years, between childhood and adulthood.
- Q2Easy
The most noticeable change at puberty is a sudden increase in:
A.Height✓ CorrectB.Eye colourC.Blood groupD.Number of teethAnswer: A. Height
Explanation: A sudden increase in height (growth spurt) is a clear change during puberty.
- Q3Easy
Chemical substances secreted by endocrine glands that control body changes are called:
A.EnzymesB.Hormones✓ CorrectC.VitaminsD.MineralsAnswer: B. Hormones
Explanation: Hormones are chemical messengers secreted by endocrine glands directly into the blood.
- Q4Easy
The sex of a baby is determined by the:
A.Mother's foodB.Type of sex chromosome from the father✓ CorrectC.ClimateD.Age of the motherAnswer: B. Type of sex chromosome from the father
Explanation: The father's sperm carries either an X or a Y chromosome, which decides the baby's sex.
- Q5Easy
For good health during adolescence, the diet should be:
A.A balanced diet✓ CorrectB.Only junk foodC.Only sweetsD.Very little foodAnswer: A. A balanced diet
Explanation: A balanced diet rich in proteins, vitamins and minerals supports rapid growth in adolescence.
- Q6Easy
The age at which the reproductive organs become functional is called:
A.Old ageB.InfancyC.Puberty✓ CorrectD.BirthAnswer: C. Puberty
Explanation: Puberty is the age at which reproductive organs mature and become functional.
- Q7Medium
Secondary sexual characteristics are features that:
A.Are present at birthB.Disappear at pubertyC.Are the same in all agesD.Develop at puberty and distinguish males from females, but are not the reproductive organs themselves✓ CorrectAnswer: D. Develop at puberty and distinguish males from females, but are not the reproductive organs themselves
Explanation: Secondary sexual characteristics (facial hair, breasts, deeper voice) appear at puberty and mark the sexes.
- Q8Medium
Why does a boy's voice often 'crack' during puberty?
A.The teeth growB.The growing voice box is not yet fully developed, so the voice is unsteady✓ CorrectC.He stops speakingD.The lungs shrinkAnswer: B. The growing voice box is not yet fully developed, so the voice is unsteady
Explanation: The larynx enlarges during puberty; while it is changing, the voice may crack before becoming deep.
- Q9Medium
How do hormones reach the organs they act on?
A.Through the bloodstream, since endocrine glands have no ducts✓ CorrectB.Through the digestive tractC.Through nerves onlyD.Through the skinAnswer: A. Through the bloodstream, since endocrine glands have no ducts
Explanation: Ductless endocrine glands release hormones into the blood, which carries them to target organs.
- Q10Medium
Why is the father, not the mother, responsible for determining the sex of the child?
A.The mother has only Y chromosomesB.Sex is decided by dietC.The mother's eggs all carry X; the father's sperm carry either X or Y, deciding the sex✓ CorrectD.The father has only X chromosomesAnswer: C. The mother's eggs all carry X; the father's sperm carry either X or Y, deciding the sex
Explanation: Eggs always carry X; whether the sperm carries X (girl) or Y (boy) determines the child's sex.
- Q11Medium
Why is a balanced diet especially important during adolescence?
A.Because growth is slowB.Because adolescents do not exerciseC.Because rapid growth and development need extra nutrients✓ CorrectD.Because food has no effectAnswer: C. Because rapid growth and development need extra nutrients
Explanation: Adolescents grow rapidly, so they need extra proteins, vitamins and minerals from a balanced diet.
- Q12Hard
Why might two healthy classmates of the same age differ greatly in height and development?
A.Puberty and its growth spurt begin at different ages in different individuals✓ CorrectB.Height never variesC.One is not humanD.They eat the same foodAnswer: A. Puberty and its growth spurt begin at different ages in different individuals
Explanation: The timing of puberty varies between individuals, so peers may differ in growth at the same age.
- Q13Hard
A boy's voice becomes deep while a girl's does not change as much. The best explanation is:
A.Boys speak moreB.Testosterone causes a larger growth of the voice box (larynx) in boys✓ CorrectC.Girls have no larynxD.Diet differencesAnswer: B. Testosterone causes a larger growth of the voice box (larynx) in boys
Explanation: Under testosterone, the boy's larynx grows more, deepening the voice.
- Q14Hard
A child in a region with iodine-poor soil and no iodised salt develops a swollen neck. The most likely cause is:
A.High blood sugarB.Excess insulinC.Too much adrenalineD.Goitre from iodine deficiency reducing thyroxine production✓ CorrectAnswer: D. Goitre from iodine deficiency reducing thyroxine production
Explanation: Without iodine the thyroid cannot make enough thyroxine and enlarges, causing goitre.
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Start this chapter free →Reaching the Age of Adolescence — FAQs
What are the key concepts in Class 8 Science Reaching the Age of Adolescence?+
This chapter covers adolescence and puberty — the physical and hormonal changes, the role of hormones, and reproductive health. Key ideas include Adolescence & puberty, Changes at puberty, Role of hormones, Sex determination.
What does Class 8 Science Chapter 107 (Reaching the Age of Adolescence) cover on XamBaaz?+
It has 72 NCERT-based MCQs on "Reaching the Age of Adolescence": 24 Easy, 24 Medium and 24 Hard. Together they make 6 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams.
Are these "Reaching the Age of Adolescence" questions free to practise?+
Yes. Sign in with Google to practise "Reaching the Age of Adolescence" free. Full unlimited access is ₹999/year on a launch offer until 1 December 2026. No chapter is charged separately.
How should I revise "Reaching the Age of Adolescence" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 6 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Reaching the Age of Adolescence" MCQs available with answers?+
Yes. 14 sample questions are shown here in full, each with the correct option and a step-by-step "Why" explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Reaching the Age of Adolescence" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Reaching the Age of Adolescence (Class 8 Science)?+
The questions that matter most test Adolescence & puberty, Changes at puberty, Role of hormones, Sex determination. This page shows 14 solved important MCQs with answers and explanations; all 72 questions on the chapter are available as timed quizzes once you sign in.
Is there an online quiz for Reaching the Age of Adolescence?+
Yes — Class 8 Science Reaching the Age of Adolescence has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.