Reaching the Age of Adolescence — Class 8 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 8 Science chapter "Reaching the Age of Adolescence" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 8 Science chapter "Reaching the Age of Adolescence" — 8 important questions with detailed answers for CBSE…
By Syllab.in · Updated
Key Questions Covered:
- What is adolescence?
- What are primary sex characteristics?
- Define secondary sex characteristics and list five in males.
- What are the secondary sex characteristics in females?
- What is the role of testosterone and estrogen?
- What is menstruation and what is its significance?
- + 2 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| What is adolescence? | ✓ Solved |
| What are primary sex characteristics? | ✓ Solved |
| Define secondary sex characteristics and list five in males. | ✓ Solved |
| What are the secondary sex characteristics in females? | ✓ Solved |
| What is the role of testosterone and estrogen? | ✓ Solved |
| What is menstruation and what is its significance? | ✓ Solved |
Showing 6 of 8 questions
Q1: What is adolescence?
Adolescence is the transitional stage of physical and psychological development between childhood and adulthood, typically occurring from 11-18 years. Marked by rapid growth, development of secondary sexual characteristics, and emotional changes.
Q2: What are primary sex characteristics?
Primary sex characteristics are organs directly involved in reproduction: testes and penis in males, ovaries and uterus in females. They are present at birth and are essential for sexual reproduction.
Q3: Define secondary sex characteristics and list five in males.
Secondary sex characteristics are physical features that develop during puberty, not directly involved in reproduction. Five in males: 1) Facial hair growth, 2) Deep voice due to larynx enlargement, 3) Increased muscle mass, 4) Broadened shoulders, 5) Body hair on chest and limbs.
Q4: What are the secondary sex characteristics in females?
Secondary sex characteristics in females: 1) Breast development, 2) Broadening of pelvis/hips, 3) Appearance of body hair (axilla, pubic area), 4) Higher-pitched voice remains, 5) Menstruation begins, 6) Increased fat deposition in breasts/hips.
Q5: What is the role of testosterone and estrogen?
Testosterone: male hormone produced by testes, stimulates development of male secondary characteristics, increases muscle growth, deepens voice. Estrogen: female hormone produced by ovaries, stimulates development of female secondary characteristics, regulates menstrual cycle, maintains pregnancy.
Q6: What is menstruation and what is its significance?
Menstruation is the monthly shedding of the uterine lining (endometrium) in females, occurring approximately every 28-30 days. It prepares the uterus for pregnancy; if fertilization doesn't occur, the lining is shed. Average duration: 3-5 days.
Showing 6 of 8 questions. Visit the full page for complete solutions.
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