Revision Notes for Class 7 Science Chapter 6: Adolescence – A Stage of Growth and Change

Quick revision notes summarizing all key concepts from Class 7 Science Chapter 6 “Adolescence: A Stage of Growth and Change”. These Class 7 Science Chapter 6 notes are ideal for quick revision just before exams.

• Adolescence is the transitional stage of development between childhood and adulthood, roughly spanning ages 10 to 19.
• Puberty marks the onset of adolescence, triggered by hormonal changes (estrogen in girls, testosterone in boys) that lead to secondary sexual characteristics.
• Physical changes only in boys: change in voice (due to voice box growth), growth of moustache and facial hair. Physical changes only in girls: development of breasts, onset of menstruation. Common to both: pimples, growth of pubic and armpit hair.
• Menstruation is the periodic (roughly 28-30 day) discharge of blood in adolescent girls; proper hygiene (regular pad changes, cleanliness, hygienic disposal) is essential.
• Adolescence involves emotional and behavioural changes too, not just physical ones: mood swings, desire for independence, peer pressure, identity exploration, and increased technology use.
• A balanced, nutrient-rich diet is essential during adolescence for rapid growth; iron-rich foods help prevent anaemia (especially important for girls due to menstrual blood loss), and calcium-rich foods support bone growth.
• Goitre (thyroid gland enlargement) results from iodine deficiency and is treated with an iodine-rich diet – distinct from the normal, harmless growth of the voice box (Adam’s apple) in boys during puberty.
• Adolescents should avoid harmful substances like alcohol and drugs, as even trying them once can lead to addiction.
• Responsible social media habits (privacy protection, not sharing personal information/location with strangers, thinking before posting) are important during adolescence.
• Government schemes supporting adolescent health include the National Iron Plus Initiative (NIPI), the Mid-Day Meal Scheme, and Anaemia Mukt Bharat (AMB).

NCERT Solutions: Class 7 Science Chapter 6
Extra Questions: Class 7 Science Chapter 6

For the full chapter, see the Class 7 Science book page and the Class 7 Science Formulas Handbook.

Written by Satish

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