Class 8 Science — Chapter 7: Reaching the Age of Adolescence
72 practice questions · 24 Easy · 24 Medium · 24 Hard
Practise Class 8 Science Chapter 7, "Reaching the Age of Adolescence", with 72 NCERT-aligned multiple-choice questions. The set is split into 24 Easy, 24 Medium and 24 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams.
"Reaching the Age of Adolescence" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Reaching the Age of Adolescence, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 8 Science mastery score. A few sample questions are shown below; sign in free to practise all 72.
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).
- Reproductive health
- A balanced diet, hygiene and exercise are important; hormones also control other body functions (e.g. thyroxine, insulin, adrenaline).
💡 Exam tips for Reaching the Age of Adolescence
- It is the father's chromosome (X or Y) that determines the child's sex — a frequently tested fact.
- Link each hormone to its gland (testosterone→testes, estrogen→ovaries, insulin→pancreas, thyroxine→thyroid).
Sample questions
The period of life between about 11 and 19 years of age is called:
Adolescence is the stage from about 11 to 19 years, between childhood and adulthood.
How do hormones reach the organs they act on?
Ductless endocrine glands release hormones into the blood, which carries them to target organs.
A child in a region with iodine-poor soil and no iodised salt develops a swollen neck. The most likely cause is:
Without iodine the thyroid cannot make enough thyroxine and enlarges, causing goitre.
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, Reproductive health.
What does Class 8 Science Chapter 7 (Reaching the Age of Adolescence) cover on XamBaaz?+
It covers 72 NCERT-aligned MCQs on "Reaching the Age of Adolescence" — 24 Easy, 24 Medium and 24 Hard — each with a timed quiz and an instant explanation, suitable 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 (limited-time launch price), with no per-chapter charges.
How should I revise "Reaching the Age of Adolescence" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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