NCERT Solutions for Class 8 Science Chapter 10
Important NCERT Questions
8th Chapter 10 Reaching the Age of Adolescence
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 4
List changes in the body that take place at puberty.
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Common changes occur among boys and girls during puberty:
• Sudden increase in height.
• Change in body shape.
• Change in voice. In boys voice becomes deep and harsh, in girls it is high pitched voice.
• Increased activity of sweat and sebaceous glands.
• Reproductive organs begin to mature.
• Appearance of secondary sexual characteristics.
Changes in Boys during puberty:
•Facial hairs such as beard and moustaches develop.
• Hair develops under the armpit, under chest and in the pubic regions.
• Voice becomes deeper.
• Muscles develop, and shoulder becomes broad.
• Increase in weight.
Changes in Girls during puberty:
• Development and enlargement of breasts.
• Hair develops under the armpit and in the pubic regions.
• Hips broaden and pelvic region widens.
• Initiation of menstrual cycle.
• Deposition of fat around hips.
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1. Physical Changes:
– Development of secondary sexual characteristics: Breast development in girls; growth of facial, underarm, and pubic hair in boys and girls.
– Growth spurt: Rapid increase in height and weight.
– Alterations in body shape: Girls experience wider hips, while boys experience broader shoulders.
– Maturation of genitals: Enlargement of testes and penis in boys; growth of the uterus and vagina in girls.
– Voice changes: Boys experience a deepening voice due to the growth of the larynx (Adam’s apple).
– Skin changes: Increased oil production leading to acne; heightened sweat production causing body odor.
2. Emotional and Psychological Changes:
– Mood swings and heightened emotional sensitivity.
– Increased curiosity and interest in relationships and sexuality.
– Growing need for independence and self-identity exploration.
– Advancements in cognitive abilities and thought processes.
These changes are primarily triggered by hormonal shifts, particularly the release of estrogen and testosterone, signifying the transition from childhood to adulthood.