NCERT Class 7 Science Chapter 6
Adolescence: A Stage of Growth and Change
This chapter helps CBSE Class 7 students understand the physical, hormonal, and emotional changes that occur during adolescence. Students learn about puberty, the role of hormones in growth, reproductive maturity, and the importance of personal hygiene and healthy habits during this stage. The chapter promotes awareness and confidence in navigating the transition from childhood to adulthood.
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Key Terms
- Adolescence
- The period of human growth and development between childhood and adulthood, typically occurring between the ages of 10 and 19 years.
- Puberty
- The stage of adolescence during which the body undergoes significant physical and hormonal changes that lead to reproductive maturity.
- Hormone
- A chemical messenger produced by glands in the body that regulates various body functions including growth, metabolism, and reproduction.
- Secondary Sexual Characters
- Physical features that appear during puberty and distinguish males from females but are not directly part of the reproductive system, such as facial hair in males and breast development in females.
- Reproductive Health
- A state of physical, mental, and social well-being related to the reproductive system, including awareness of hygiene and healthy practices during adolescence.
- Endocrine Gland
- A gland that secretes hormones directly into the bloodstream. Examples include the pituitary gland, thyroid, and adrenal glands.
Frequently Asked Questions
What is adolescence and when does it occur?▾
Adolescence is the phase of development between childhood and adulthood, generally between ages 10 and 19. It is marked by rapid physical, emotional, and social changes, beginning with puberty.
What changes occur during puberty in boys and girls?▾
In boys, puberty causes growth of facial and body hair, voice deepening, and development of the reproductive system. In girls, it causes breast development, widening of hips, onset of menstruation, and growth of body hair.
What are hormones and what role do they play in adolescence?▾
Hormones are chemical messengers produced by endocrine glands. During adolescence, hormones like testosterone in boys and oestrogen in girls trigger puberty and control the development of secondary sexual characteristics.
What is the importance of personal hygiene during adolescence?▾
During adolescence, increased sweat gland activity can cause body odour and skin problems like acne. Regular bathing, use of deodorants, clean clothing, and proper menstrual hygiene for girls are essential to maintain health and confidence.
What is the role of the pituitary gland during adolescence?▾
The pituitary gland, located in the brain, acts as a master gland that triggers other endocrine glands to release hormones. During adolescence, it signals the release of growth hormone and reproductive hormones that drive pubertal changes.
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