Class 7 Science - KERALA
Adolescence: A Stage of Growth and Change
The chapter 'Adolescence: A Stage of Growth and Change' for Kerala SCERT Class 7 Science explores the fascinating transition period from childhood to adulthood. Students learn about puberty, physical and mental changes, hormonal control by endocrine glands, reproductive health, and the importance of personal hygiene and balanced nutrition during this rapid growth phase. This chapter is vital for the Kerala State board exams as it covers fundamental biological concepts related to human development, health, and adolescence, frequently appearing in both objective and short-answer sections.
Start Learning FreeKey Concepts
Adolescence and Puberty
Adolescence is the transitional period between childhood and adulthood, while puberty is the time when a child's body develops primary and secondary sexual characteristics and becomes capable of reproduction.
Secondary Sexual Characters
These are physical changes that help distinguish males from females, such as the growth of facial hair and deepening of voice in boys, and the development of breasts and widening of hips in girls.
Role of Hormones
Hormones are chemical substances secreted by endocrine glands that control and coordinate all the dramatic changes during adolescence, including the action of testosterone in boys and estrogen in girls.
Reproductive Phase in Humans
Unlike in childhood, males and females reach reproductive maturity during adolescence, marked by sperm production in males and the release of eggs and menstruation in females.
Nutritional Needs and Personal Hygiene
Adolescents experience rapid growth spurts requiring a balanced diet rich in proteins, carbohydrates, and minerals, along with strict personal hygiene to prevent infections during hormonal shifts.
Important Formulas
Board Exam Info
This chapter typically carries around 4 to 6 marks in the Kerala (SCERT) Class 7 Science examinations. Common question types include defining puberty, naming the endocrine glands and their hormones, explaining secondary sexual characters, and answering application-based questions on balanced diets and personal hygiene during adolescence.
Frequently Asked Questions
What is the difference between adolescence and puberty?
Adolescence is the overall period of transition from childhood to adulthood (spanning several years), whereas puberty is the specific biological stage within adolescence when a person becomes capable of reproduction.
Why do adolescents get acne and pimples?
During puberty, increased activity of sweat and sebaceous (oil) glands in the skin, stimulated by hormonal changes, often leads to acne and pimples.
Which gland is known as the master gland?
The pituitary gland is called the master gland because it secretes hormones that stimulate other endocrine glands to produce their own hormones.
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