Define adolescence class 8

Reaching the age of adolescence Class 8 Science Chapter 10 as per NCERT Book used in CBSE and other Schools. The lesson covers the complete explanation of class 8 Chapter 10 Reaching the age of adolescence. Topics covered are puberty, secondary sexual characters, endocrine glands, hormones and their secretions. The lesson covers all important questions and NCERT solutions to book questions have also been provided for convenience of the students. different stages of life endocrine glands puberty hormones exocrine glands NCERT Book Solutions Reaching the age of adolescence Class 8 Video Explanation Infancy- It is the growth period of baby from birth to 2 years. Childhood- As you can these kids. They are in their childhood age from 3 to 12 years. This is the age of fun. Adolescence- This is the period of transition from childhood to adulthood from the age of 13-19 years. As you can see these girls in the image they are in their transition period that is in their adolescence period. Adulthood period- This is the age between 20-40 years of age. In this age you become mature and start thinking about how to shape up your career. Old Age- This is the age meant for resting that is the age above 40 years and the people of this age are very mature because they have crossed all the stages of life. Therefore ,they gain a lot of experience which makes them mature. Top Puberty Before reading adolescence we should study about a term known as Puberty. Puberty is a stage when a boy or girl ...

Question 1 What is puberty? Question 2 Who attain puberty at an earlier age in human beings: Boys or girls? Question 3 Which is the most conspicuous change in boys and girls during puberty? Question 4 State changes that happens during puberty in boys? Question 5 State changes that happens during puberty in girls? Puberty A baby is born with a full set of reproductive organs, these organs do not function during the first 10 or 12 years of life. Under the influence of hormones produced in the body, the reproductive organs become active at the time known as puberty. At puberty, sex hormones or gametes begin to be produced due to which the boys and girls become sexually mature. The period during which adolescent boys and girls reach sexual maturity and become capable of reproduction is called puberty. Puberty is a period of several years in which rapid physical growth occurs leading to sexual maturity. It tends to start earlier in girls than in boys. Girls attain puberty at a age of 10 to 13 yrs while boys reach puberty at a age of 12 to 14 yrs. Changes which occur in boys during puberty are: (1) Hair grow on the face in the form of moustache and beard, and on the chest. (2) Voice deepens in boys. It becomes low pitched voice. (3) Testes start to make sperm. (4) Testes and penis become larger. (5) Chest and shoulders of boys broaden. (6) Body become muscular. (7) Hair grows in armpits and in pubic regions between the thighs. (8) Rapid increase in height occurs. (9) Feeling sex...

Reaching the Age of Adolescence Adolescence is that time of life when a child reaches reproductive maturity. This is indicated by a number of changes occurring in the body. The process of these changes is known as puberty. It begins at the age of around 10 and lasts until the age of 19. The period of adolescence is known as the teenage. Changes at Puberty Increase in Height There is a sudden increase in height when one reaches puberty. Long bones grow rapidly, which results in an increase in height. The maximum height is attained by 18 years of age. Change in Body Shape Boys become muscular. Their shoulders widen and the waist becomes narrow. The girls widen below the waist and narrow at the shoulders. Change in Voice The boys develop a deep and hoarse voice. This happens because the voice box becomes larger. The voice of the girls is usually high-pitched. Increased Activity of Sweat and Sebaceous Gland The secretions from the sweat and sebaceous glands increase at this time due to which many teenagers suffer from acne. Development of Sex Organs In boys, the testes and penis enlarge and the production of sperms begin. In girls, the ovaries enlarge and start releasing matured eggs. Secondary Sexual Characters These characters help to distinguish between a male and a female. These include: In Boys: Hair on the face and chest, hair under armpits and pubic region, deep voice. In Girls: Breast enlargement, high-pitched voice, hair under armpits and pubic region. Hormonal Change...

NCERT Solutions for Class 8 Science Chapter 10 Reaching The Age of Adolescence Topics and Sub Topics in Class 8 Science Chapter 10 Reaching The Age of Adolescence: Section Name Topic Name 10 Reaching The Age of Adolescence 10.1 Adolescence and Puberty 10.2 Changes at Puberty 10.3 Secondary Sexual Characters 10.4 Role of Hormones in Initiating Reproductive Function 10.5 Reproductive Phase of Life in Humans 10.6 How is the Sex of the Baby Determined? 10.7 Hormones other than Sex Hormones 10.8 Role of Hormones in Completing the Life History of Insects and Frogs 10.9 Reproductive Health Reaching the Age of Adolescence Class 8 Science NCERT Textbook Questions Question 1. What is the term used for secretions of endocrine glands responsible for changes taking place in the body? Answer: Hormones Question 2. Define adolescence. Answer: The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence. The period of adolescence is normally 11 years to 19 years. Question 3. What is menstruation? Explain. Answer: In females, the ova or eggs begin to mature with the onset of puberty (10 to 12 years of age) one egg get matured and is released by one of the ovaries once in about 28 to 30 days. During this period, the wall of the uterus becomes thick so as to receive the fertilized egg. In case it is fertilized, it begins to develop. This results in pregnancy. If the fertilization fails to take place, the ovum or the released egg and the thickene...

A. Answer the following questions in short: 1. What is the term used for secretions of endocrine glands responsible for changes taking place in the body? 2. Define adolescence. 3. What is menstruation? Explain. 4. List changes in the body that take place at puberty. 5. Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them. Answer: 6. What are sex hormones? Why are they named so? State their function. 7. Write notes on: (a) Adam’s apple. (b) Secondary sexual characters. (c) Sex determination in the unborn baby. 8. The table given on next page’ shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs? 9. Name four body processes that hormones control. 10. We should avoid taking medicines/drugs unless prescribed by a doctor. Give reasons. 11. Our government has legalised the age for marriage in boys and girls. Give reasons as to why one should get married after a certain age. B. Tick (✓) the correct option: 1. Adolescents should be careful about what they eat, because: (a) proper diet develops their brains (b) proper diet is needed for the rapid growth taking place in their body (c) adolescents feel hungry all the time (d) taste buds are well developed in teenagers 2. Reproductive age in women starts when their: (a) menstruation starts (b) breasts start developing (c) body weight incre...

Many changes take place during adolescence. Prominent among these are physical changes, including adolescence, transitional phase of growth and young people, which refers to individuals between ages 10 and 24. In many societies, however, adolescence is narrowly equated with adolescence typically refers to the period between ages 12 and 20 and is roughly equivalent to the word teens. mental disorder: Disorders usually first evident in infancy, childhood, or adolescence During adolescence, issues of emotional (if not physical) separation from parents arise. While this sense of separation is a necessary step in the establishment of personal values, the transition to self-sufficiency forces an array of adjustments upon many adolescents. Furthermore, teenagers seldom have clear roles of their own in society but instead occupy an Some specialists find that the difficulties of adolescence have been exaggerated and that for many adolescents the process of maturation is largely peaceful and untroubled. Other specialists consider adolescence to be an intense and often stressful developmental period characterized by specific types of behaviour. Physical and psychological transition Historically, many societies instituted formal ways for older individuals to help young people take their place in the Get a Britannica Premium subscription and gain access to exclusive content. The Kumauni hill tribes of northern India offer a vivid example of a Social constraints From a biological perspe...

Reaching the Age of Adolescence: Adolescence is a time of great change, both physically and psychologically. Class 8 Science Chapter 10 – Reaching the age of Adolescence deals with adolescence, changes in adolescence, and hormones in adolescence, sexual maturation in boys and girls, and menstrual cycles. Students learn about all these in this chapter. Puberty, sexual characteristics, the roles of hormones in females, sex determination, and reproductive health are among the subjects covered in Ch 10 Science Class 8 . For Reaching the Age of Adolescence Class 8, INFINITY LEARN delivers free insight and information. The teaching staff is highly qualified, with a focus on effective teaching skills. CHAPTER 10_REACHING THE AGE OF ADOLESCENCE NCERT SOLUTIONS 1.What is the term used for secretions of endocrine glands responsible for changes taking place in the body? A. Hormones. 2. Define adolescence. A. The period of life, when the body undergoes changes, leading to reproductive maturity is called adolescence. 3. What is menstruation? Explain. A. The cycle of changes that occur in female reproductive system once in every 28-30 days is called menstrual cycle. i) The uterine wall in females prepares itself to receive the developing fertilised ii) In case there is no fertilisation, the thickened lining of the uterine wall breaks down and goes out of the body along with blood. This is called menstruation. iii) Menstruation occurs once in about 28 to 30 days. iv) The first menstrual ...