NCERT Exemplar Solution for Class 8 Science Chapter-10 - Reaching the Age of Adolescence
Adolescence is a significant stage in human life when a child gradually develops into an adult, both physically and emotionally. The chapter “Reaching the Age of Adolescence” explains the various changes that occur during this period, including growth in height, development of reproductive organs, hormonal changes, emotional maturity, and the importance of maintaining good health. It helps students understand puberty and the biological processes that prepare the body for adulthood. The chapter also spreads awareness about balanced nutrition, personal hygiene, and healthy habits during teenage years. The NCERT Exemplar Solution for Class 8 provides clear explanations and concept-based questions that help students understand this sensitive and important topic confidently. By studying the NCERT Exemplar Solution, learners can strengthen their understanding of human growth and development. These well-designed NCERT solutions for class 8 also help students prepare effectively for examinations while promoting scientific awareness about adolescence and health.
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Changes During Adolescence and Puberty
Adolescence is the period between childhood and adulthood, usually beginning around the age of 11 and lasting until 18 or 19 years. During this phase, the body undergoes rapid growth and development. Puberty is the stage within adolescence when the reproductive organs become mature and capable of reproduction.
One of the most noticeable changes during adolescence is an increase in height. Bones of the arms and legs grow rapidly, making teenagers taller. Changes also occur in body shape and muscle development. Boys generally develop broader shoulders and stronger muscles, while girls experience widening of the hips and development of mammary glands. The voice also changes during puberty because of the enlargement of the voice box or larynx. In boys, the voice becomes deeper due to the growth of the Adam’s apple. Hair growth in areas such as underarms and around reproductive organs is another common sign of puberty.
The chapter explains that these changes occur due to hormones produced by endocrine glands. Hormones are chemical substances that regulate growth, metabolism, and reproductive functions. The pituitary gland is often called the master gland because it controls several other endocrine glands in the body. The NCERT Exemplar Solution for Class 8 helps students understand these concepts through practical examples and reasoning-based questions. It also encourages awareness about the natural physical and emotional changes experienced during adolescence.
Role of Hormones and Reproductive Health
Hormones play a very important role in controlling body functions during adolescence. In boys, the testes produce male hormones called testosterone, while in girls, the ovaries produce female hormones called oestrogen. These hormones are responsible for the development of secondary sexual characteristics and reproductive maturity. The chapter also explains the menstrual cycle in girls, which begins during puberty. Menstruation is a natural biological process that indicates reproductive maturity. Understanding menstruation helps students develop awareness and remove myths or misconceptions related to adolescence.
Adolescence is also a stage when emotional and mental changes become more noticeable. Teenagers may experience mood swings, increased sensitivity, and changes in behaviour due to hormonal activity. The chapter encourages students to maintain confidence and communicate openly with parents, teachers, or guardians regarding physical and emotional concerns. Personal hygiene is another important topic covered in the chapter. During adolescence, sweat and oil glands become more active, making cleanliness essential. Bathing regularly, wearing clean clothes, maintaining dental hygiene, and eating healthy food help maintain good physical health.
The NCERT Exemplar Solution explains the importance of balanced nutrition during adolescence. A nutritious diet containing proteins, vitamins, minerals, carbohydrates, and iron supports proper growth and development. Junk food and unhealthy habits should be avoided to maintain physical fitness and overall well-being.
Endocrine Glands and Healthy Lifestyle
The human body contains several endocrine glands that release hormones directly into the bloodstream. Important glands discussed in this chapter include the pituitary gland, thyroid gland, adrenal glands, pancreas, testes, and ovaries. Each gland performs specific functions essential for body growth and regulation. The thyroid gland controls metabolism and growth through the hormone thyroxine. The pancreas regulates blood sugar levels by producing insulin. Adrenal glands help the body respond to stress and emergencies. The proper functioning of endocrine glands is necessary for maintaining overall health.
The chapter also emphasises the importance of physical exercise and healthy habits during adolescence. Regular exercise strengthens muscles and bones, improves blood circulation, and helps maintain mental health. Students are encouraged to avoid harmful substances such as tobacco, alcohol, and drugs because these can negatively affect growth and health.
The NCERT solutions for class 8 make these biological concepts easy to understand through detailed explanations and examples from daily life. Exemplar questions also improve students’ analytical skills and help them answer conceptual questions more effectively in examinations. Understanding adolescence is important because it prepares students for responsible adulthood and healthy living. This chapter creates awareness about physical growth, emotional balance, and personal care while helping students appreciate the natural changes taking place in the human body.
Importance of Studying Reaching the Age of Adolescence
This chapter plays a major role in creating awareness about human growth and development. It helps students understand the scientific reasons behind physical and emotional changes during teenage years. It also encourages healthy habits, balanced nutrition, and personal hygiene.
The NCERT Exemplar Solution for Class 8 strengthens conceptual clarity through application-based questions and detailed explanations. By practising exemplar questions regularly, students can improve their confidence, scientific understanding, and examination performance while developing a positive attitude towards adolescence and health.