NCERT Exemplar Class 8 Science Chapter 10 Solutions: Reaching the Age of Adolescence
NCERT Exemplar Class 8 Science Solutions Chapter 10 ‘Reaching the Age of Adolescence’ are created to enable you to solve the questions given in the exemplar exercises effortlessly. In this chapter of NCERT Exemplar Class 8 Science, you will learn about adolescence and puberty, the changes that occur in boys and girls at the time of puberty. You will also become aware of the secondary sexual characters and the role of hormones in initiating the reproductive functions, reproductive health and the harmful effects of drugs.
In this chapter, there are 28 questions in 1 exemplar exercise. The questions are of objective as well as subjective nature. There are match the columns, true or false, fill in the blanks, and multiple-choice exercises besides the long answer type questions which are based on our day to day lives. You will get to learn the location of endocrine glands in the labelling of diagrams exercises along with various other hormonal glands.
Instasolv has prepared the answer in sync with the latest CBSE exam trends. The science experts at Instasolv are experienced and updated which helps them in addressing the most recurring doubts. Any queries that you might encounter while solving the NCERT Exemplar problems for Class 8 Science chapter 10 have been proactively covered by us.
Important Topics for NCERT Exemplar Class 8 Science Solutions Chapter 10 – Reaching the Age of Adolescence
Introduction to Adolescence and Puberty
- The period of life in which the body of a child undergoes some major visible changes that lead to reproductive maturity is termed as adolescence.
- It begins around the age of 11 and lasts up to around 18 years of age.
- The beginning of adolescence represents the onset of puberty.
- A balanced diet, personal hygiene, and physical exercise are important to maintaining Reproductive Health.
- One should strictly avoid the usage of addictive drugs.
Changes at Puberty
- Height: The bones of the arms and legs elongate expeditiously thus leading to maximum growth in height during this period.
- Body Shape: In girls, the area below the waist gets wider while in boys, their shoulders broaden. The growth of muscles is more prominent in boys.
- Voice: The voice of boys gets deeper due to the growth of the adam’s apple and girls get a high pitched voice during puberty.
- Sweat and Sebaceous Glands: There is more secretion from these glands during puberty which leads to pimples and acne.
- Sex Organs: Testes begin producing sperms and ovaries begin to release matured eggs.
- Intellectual Maturity: This is the most efficient stage of learning. An adolescent spends more time thinking and analyzing.
Secondary Sexual Characters
- Other prominent changes such as the growth of facial hair in boys and the development of breasts in girls are known as secondary sexual characters.
- These occur due to the hormones released by our endocrine glands controlled by the pituitary gland. Testosterone is secreted by testes while estrogen is released by ovaries.
- Role of Hormones in initiating reproductive functions: Glands release hormones in the bloodstream to make them reach the ‘target site’. The hormones from pituitary gland kickstart ovaries and testes which in turn leads to the onset of puberty.
- In females, the reproductive phase is from 10/11 years of age to 45 to 50 years of age.
- Menstruation occurs in women until they reach the age of menopause.
- Chromosomes determine the sex at the time of birth, XX chromosomes lead to female offspring and XY leads to male offspring.
- There are also other hormones released by several glands such as adrenaline, growth hormones, thyroxine, insulin, etc.
- In tadpoles, the thyroid is activated by iodine in water, which helps them in growing into an adult frog.
Exercise Discussion of the NCERT Exemplar Class 8 Science Chapter 10
- There are 6 multiple-choice questions in this chapter of NCERT Exemplar Class 8 Science. The very short answer section in this exemplar exercise requires you to give one-word answers in the naming questions. There are also unscrambling of words questions in these exercises.
- The short-answer section of exercise questions consists of reasoning questions which will help you attain a conceptual understanding of the chapter.
- The short answer type questions include fill in the blanks questions related to diet and hormonal changes.
- There are 10 long answer type questions that involve various tabulating and listing exercises besides the labelling question of the endocrine system in humans. There are also some data interpretation questions in the exemplar long answer section.
Why use NCERT Exemplar Class 8 Science Solutions Chapter 10 by Instasolv?
- The experts of Instasolv have covered all the topics in your syllabus for class 8 Science Chapter 10 in a detailed manner using the question-answer format.
- The solutions to NCERT Exemplar problems for Class 8 Science Chapter 10 prepared by Instasolv are ideal for CBSE exam preparation.
- We have provided comprehensive assistance covering each question in a step by step format to guide you in an interactive way.
- The solutions are created in a simple and easy-to-understand language.