NCERT Solutions Class 8 Science Chapter 7 Reaching the Age of Adolescence - PDF Download

NCERT solutions for class 8 science chapter 7 reaching the age of adolescence is the best study material for students who are struggling to prepare for their exams. NCERT solutions for class 8 science chapter 7 reaching the age of adolescence answers all the questions in the NCERT textbook. Students can also download NCERT solutions for class 8 science chapter 7 reaching the age of adolescence in PDF format for preparing their notes and writing class assignments.

NCERT solutions for class 8 science chapter 7 reaching the age of adolescence teaches students about Adolescence, Changes in Adolescence and Hormones in Adolescence, Sexual maturation in Boys and Girls, menstrual Cycle. NCERT solutions class 8 science chapter 7  reaching the age of adolescence pdf by eSaral also teaches students about puberty, Sexual characters, and Roles of Hormones in Females, Sex Determination and Reproductive health.

Class 8 science chapter 7 NCERT solutions pdf download include accurate answers to all the questions in the Class 8 textbook provided by the CBSE. NCERT solutions for class 8 science chapter 7 reaching the age of adolescence is prepared by subject-specific experts in a well-structured manner, in accordance with the latest syllabus and CBSE guidelines. You can download NCERT class 8 science chapter 7 solutions free pdf from eSaral. 

NCERT Solutions for Class 8 Science Chapter 7 Topics

7.1 Adolescence and Puberty: As discussed in NCERT solutions for class 8 science reaching the age of adolescence, Adolescence is a part of life that happens naturally. It's when your body starts to change and become more mature. There are a few changes that happen during this time. These changes are called puberty.

7.2 Changes at Puberty: As discussed in NCERT solutions for class 8 science reaching the age of adolescence, Puberty is characterized by rapid changes in growth and development. It is characterized by physical changes, hormonal changes, and emotional changes. The endocrine system is activated during puberty, and these changes are necessary for sexual development and reproduction.

Following subtopics will be discussed in the section 7.2 changes at puberty:

• Increase in Height

• Change in Body Shape

• Voice change

• Development of sex organ

• Increased activity of sweat and sebaceous glands

• Reaching mental, intellectual and emotional maturity

7.3 Secondary Sexual Characters: As discussed in NCERT solutions for class 8 science reaching the age of adolescence, Secondary sexual features are physical characteristics that come into play during puberty and are not directly related to sexual reproduction. Secondary sexual characteristics help to differentiate between men and women, and play an important role in attraction and sexual maturity.

7.4 Role of Hormones in Initiating Reproductive Function: As discussed in NCERT solutions for class 8 science reaching the age of adolescence, Hormones are essential for the initiation and regulation of reproductive functions in both men and women. The endocrine glands produce hormones that are responsible for the coordination of various bodily functions. Within the reproductive function, hormones play a role in the development of puberty, secondary sexual development, and the maintenance of the reproductive cycle.

7.5 Reproductive Phase of Life in Humans: As discussed in NCERT solutions for class 8 science reaching the age of adolescence, The reproductive phase of human life is the period in which a person is able to reproduce sexually. It is the stage in which a person reaches sexual maturity, beginning with puberty.

7.6 How is the Sex of the Baby Determined?: As discussed in NCERT solutions class 8 science chapter 7  reaching the age of adolescence pdf by eSaral, The gender of a child is determined by a set of sex chromosomes that are inherited by both parents. Human beings possess two sets of sex chromosomes, X and Y, which together determine whether a child will be a male (XY) or a female (XX).

7.7 Hormones other than Sex Hormones: As discussed in NCERT solutions class 8 science chapter 7  reaching the age of adolescence pdf by eSaral, Along with sex hormones (estrogen, progesterone and testosterone), the human body produces many other hormones that play important parts in regulating various bodily functions. Hormones are secreted by different glands in the endocrine system. Hormones play important roles in maintaining homeostasis, promoting growth, controlling metabolism and promoting overall health.

7.8 Role of Hormones in Completing the Life History of Insects and Frogs: As discussed in NCERT solutions class 8 science chapter 7  reaching the age of adolescence pdf by eSaral, Hormones are really important in how insects and frogs live their lives. They help them grow from eggs to adults, and in insects, this process is called metamorphosis. In frogs, the same thing happens, but there are some differences.

7.9 Reproductive Health: As discussed in NCERT solutions for class 8 science reaching the age of adolescence, Reproductive health is all about making sure your reproductive system is healthy and working properly, both physically and mentally. It covers everything from sexual health and fertility to family planning, safe sex, and how to prevent and treat reproductive issues. It's important for everyone's health, but it's also important for the health of our communities and society.

Key Features of Class 8 Science Chapter 7 

• After puberty, humans become able to reproduce. Children aged 11 to 19 years are referred to as “adolescents”. 

• During puberty, the reproductive organs grow, hair grows at various locations on the body, breasts develop in girls, and moustaches and beards appear in boys. 

• Boys’ voice becomes hoarse as their voice box expands during adolescence. Children grow taller during adolescence. 

• The growth of reproductive organs and the maturity of reproductive parts are regulated by hormones. 

• The hormones are secreted directly into the bloodstream by endocrine glands. The endocrine glands include the pituitary gland, which secretes growth hormone, as well as hormones that are secreted by other glands like the testes and ovaries, as well as thyroid and adrenals. 

• The pancreas secures insulin, the thyroid produces thyroidroxine, and the adrenals secrete adrenalin.

• The female reproductive system is equipped with two hormones: testosterone, which is the male hormone, and estrogen, which is the female hormone. 

• During pregnancy, the uterine wall of the female prepares to receive the developing fertilised egg. 

• If fertilisation is not achieved, the thickened wall of the uterine wall collapses and the blood is excreted, a process known as menstruation. 

• The gender of the unborn child is determined by whether the zygote has the XX or XY chromosome. 

• It is essential to maintain a balanced diet and maintain good personal hygiene during adolescence.

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Frequently Asked Questions

Question 1: What is adolescence?

Answer 1: Adolescence refers to the period of time between puberty and adulthood. Adolescence is characterized by changes in the body, emotions, and personality. It is marked by secondary sexual development, rapid physical growth, and puberty.

Question 2: What are secondary sexual characteristics? 

Answer 2: Secondary sexual characteristics are physical changes that occur during puberty that are not directly linked to sexual reproduction. Examples of secondary sexual characteristics include breast development and widening of the hips in females, and facial hair growth and voice deepening in males.