All Courses
Get the App Signup / Login
Sign in Open App
Class 8 Exam  >  Class 8 Notes  >  NCERT Solutions - Reaching Age of Adolescence, Class 8, Science

Reaching Age of Adolescence, Class 8, Science NCERT Solutions PDF Download

Chapter 10. Reaching The Age Of Adolescence | Science | CBSE Class VIII (8th) | Solved Exercises

 
Question 1. What is the term used for secretions of endocrine glands responsible for changes taking place in the body?
Answer :The secretions of endocrine glands responsible for changes taking place in the body is called hormones.Hormones are chemical substances, which are released by endocrine glands directly into the blood stream.. The changes which occur at onset of puberty and adolescence are controlled by hormones
Question 2. Define adolescence.
Answer :The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence.Adolescence begins around the age of 11 and lasts upto 18 or 19 years of age.Since this period covers the ‘teens’ , adolescents are also called ‘teenagers’. In girls, adolescence may begin a year or two earlier than in boys. Also, the period of adolescence varies from person to person.The Adolescence is marked by the onset of puberty in which growth of the reproductive organs , change in body size, change in body height, change in Voice etc takes place.
Question 3. What is menstruation? Explain.
Answer :In females, the reproductive phase starts at onset of puberty around 10 to 12 years of age and continues till 40-45 yrears of age. During this period, One ovum matures 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 and prepares itself to receive the developing fertilised egg. In case there is no fertilisation, the released egg, and the thickened wall lining of the uterus along with its blood vessels, breaks down and goes out of the body. This periodic bleeding due to reproductive cycle in women which is called menstruation.
Question 4. List changes in the body that take place at puberty.
Answer :List changes in the body that take place at puberty. 
  1. Increase in Height - The most visible change during puberty is the sudden increase in body height.
  2. Change in Body Shape - The onset of puperty is marked by characteristic changes in body shape.In boys, the shoulders of boys generally broaden . In girls,the region below the waist becomes wider. In boys, the muscles of the body grow more prominently than in the girls.Thus, changes occurring in adolescent boys and girls are different.
  3. Voice Change - At puberty, the voice box or the larynx begins to grow.Boys develop larger voice boxes than girls, resulting in Generally, girls have a high pitched voice, whereas boys have a deep voice..
  4. Increased Activity of Sweat and Sebaceous Glands-During puberty the secretion of sweat glands and sebaceous glands (oil glands) increases. Many young people get acne and pimples on the face at this time because of the increased activity of these glands in the skin.
  5. Development of Sex Organs- At puberty, male sex organs like the testes and penis develop completely. The testes also begin to produce sperms. In girls, the ovaries enlarge and eggs begin to mature. Also ovaries start releasing mature eggs.During this period change in Secondary Sexual Characters results in development of breasts in girls and apperance of facial hair (moustache and beard) boys.
  6. Reaching Mental, Intellectual and Emotional Maturity -The puberty is marked by Adolescence stage, in which a person becomes more thoughtful, concious and independent than before
Question 5. Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.
Answer : 
 
Names of Endocrine Glands Type of hormones secretions
Pituitary gland Growth Hormone & Hormone Stimutors
Pancreas Insulin
Thyroid Thyroxine
Adrenals Adrenalin
Testes Testosterone
ovaries Estrogen, 
   
class 8,Science,Reaching,Age,of,Adolescence, NCERT, Solutions
Question 6. What are sex hormones? Why are they named so? State their function.
Answer :-The sex hormones are also known as male hormone (testosterone) and female hormone (estrogen). These are sereted by testes and ovaries in male and female respectively. These hormones are responsible for the male and female secondary sexual characters. Further, the sex hormones, under the control of hormones from the pituitary gland,secrete many hormones, one of which makes ova mature in the ovaries and sperms form in the testes
Question 7. Choose the correct option. 
  1. Adolescents should be careful about what they eat, because
    1. proper diet develops their brains.
    2. proper diet is needed for the rapid growth taking place in their body.
    3. adolescents feel hungry all the time.
    4. taste buds are well developed in teenagers.
  2. Reproductive age in women starts when their
    1. menstruation starts.
    2. breasts start developing.
    3. body weight increases.
    4. height increases.
  3. The right meal for adolescents consists of
    1. chips, noodles, coke
    2. chapati, dal, vegetables.
    3. rice, noodles and burger.
    4. vegetable cutlets, chips and lemon drink.
Answer : 
  1. Adolescents should be careful about what they eat, because - (ii) Proper diet is needed for the rapid growth taking place in their body.
  2. Reproductive age in women starts when their - (i) menstruation starts
  3. The right meal for adolescents consists of -(ii) chapati, dal, vegetables.
Question Write notes on— 
  1. Adam’s apple.
  2. Secondary sexual characters.
  3. Sex determination in the unborn baby.
Answer :- 
 
 
  1. Adam’s apple : At puberty, the voice box or the larynx begins to grow. Boys develop larger voice boxes than girls. Due to this, Generally, girls have a high pitched voice, whereas boys have a deep voice. The growing voice box in boys, which is visible as a protruding part of the throat, is called Adam’s apple.
  2. Secondary sexual characters : During onset of puberty in human beings, apart from the growth of reproductive organs such as testes and ovaries in males and females, There are other apparent visible changes, which are distinct in male and females and can be noticed on seeing. In girls, breasts begin to develop at puberty and boys begin to grow facial hair, as moustaches and beard. All these features, which help in to distinguish the male from the female , are called secondary sexual characters.
  3. Sex determination in the unborn baby :The thread like structures, chromosomes, present inside a fertilised egg or zygote are the embedded instruction for determining the sex of the baby. All human beings have 23 pairs of chromosomes in the nuclei of their cells. Two chromosomes out of these are the sex chromosomes,named X and Y. A female has two X chromosomes, while a male has one X and one Y chromosome. The gametes (egg and sperm) have only one set of chromosomes. The unfertilised egg always has one X chromosome. When a sperm containing X chromosome fertilises the egg, the zygote would have two X chromosomes and develop into a female child. If the sperm contributes a Y chromosome to the egg (ovum) at fertilisation, the zygote would develop into a male child.
Question 8. Word game : Use the clues to work out the words. 
  1. Across
    • 3. Protruding voice box in boys
    • 4. Glands without ducts
    • 7. Endocrine gland attached to brain
    • 8. Secretion of endocrine glands
    • 9. Pancreatic hormone
    • 10. Female hormone
  2. Down
    • 1. Male hormone
    • 2. Secretes thyroxine
    • 3. Another term for teenage
    • 5. Hormone reaches here through blood stream
    • 6. Voice box
    • 7. Term for changes at adolescence
- - - - - - - - - - - - - - - - - - 1- - - - - -
- - - - - - - - - - - - - - - - - - E - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - 2- - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - R - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - 3-A - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - 4- - D- - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - 5 -
- - - - - - 6 - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - 7-P - - - - - - - -
- - - - 8- - - M - - - - - - - - - - - - - - - -
- - - - - - Y - - - - - - - - - - - - - - - - -
9 - S - - - - - - 10 - T - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - S -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - -

Answer :-
- - - - - - - - - - - - - - - - - - 1T - - - - -
- - - - - - - - - - - - - - - - - - E - - - - -
- - - - - - - - - - - - - - - - - - S - - - - -
- - - - - - - - - - - - - - - - - - T - - - - -
- - - - - - - - - - - - - - - - - - O - - - - -
- - - - - - - - - - 2T - - - - - - - S - - - - -
- - - - - - - - - - H - - - - - - - T - - - - -
- - - - - - - - - - Y - - - - - - - E - - - - -
- - - - - - - - - - R - - - - - - - R - - - - -
- - - - - - - - - - O - - - - - - - O - - - - -
- - - - - - - - - - I - - - - - - - N - - - - -
- - - - - - - - - 3A D A M S A P P L E     - - -
- - - - - - - - - D - - - - - - - - - - - - - -
- - - - - - - - - O - - - - - - - - - - - - - -
- - - - - - - - - L - - - - - - - - - - - - - -
- - - - - - - - - 4E N D O C R I N E - - - - - -
- - - - - - - - - S - - - - - - - - - - - - 5T -
- - - - - - 6L - - C - - - - - - - - - - - - A -
- - - - - - A - - E - - - - - 7P I T U I T A R Y
- - - - 8H O R M O N - - - - - U - - - - - - G -
- - - - - - Y - - C - - - - - B - - - - - - E -
9I N S U L I N     10E S T- R O G E N - - - - - T -
- - - - - - - - - - - - - - - - - - - - - - S -
- - - - - - - - - - - - - - - - - - - - - - I -
- - - - - - - - - - - - - - - - - - - - - - T -
- - - - - - - - - - - - - - - - - - - - - - E -
Question 10. The table below 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? 
class 8,Science,Reaching,Age,of,Adolescence, NCERT, Solutions

Answer :- 
  1. At the time of birth the height of the boys and Girls are identical
  2. From the time of birth, till the age of 8 years, The height of boys grow sligtly more than girls.
  3. After the age of 8 years, the height of girls outpaces the height of boys till the age of 12 years.
  4. After age of 12 years, the height of boys increases at slightly faster rate and becomes almost equal to that of girls at 16th year
  5. After 16th year, the boys continued to grow more in height till the age of 20 years

 

The document Reaching Age of Adolescence, Class 8, Science NCERT Solutions is a part of Class 8 category.
All you need of Class 8 at this link: Class 8

Top Courses for Class 8

FAQs on Reaching Age of Adolescence, Class 8, Science NCERT Solutions

1. What is adolescence?
Ans. Adolescence is the transitional stage of development between childhood and adulthood, typically occurring between the ages of 10 and 19. It is a period of significant physical, emotional, and psychological changes, as well as the onset of sexual maturity.
2. What are the physical changes that occur during adolescence?
Ans. During adolescence, several physical changes occur in both boys and girls. In boys, there is an increase in height, development of facial hair, deepening of voice, and enlargement of the testes and penis. In girls, there is breast development, growth of pubic hair, widening of hips, and the onset of menstruation.
3. How does adolescence affect emotional and psychological development?
Ans. Adolescence is characterized by emotional and psychological changes as well. Teenagers often experience mood swings, increased self-consciousness, and a desire for independence. They may also face challenges related to identity formation, peer pressure, and dealing with societal expectations.
4. What is the role of hormones during adolescence?
Ans. Hormones play a crucial role in the physical and emotional changes during adolescence. The pituitary gland releases hormones that trigger the growth spurt, sexual development, and maturation of reproductive organs. Hormonal changes also influence mood, emotions, and behavior during this stage.
5. How can parents support adolescents during this phase?
Ans. Parents can support adolescents by maintaining open communication, showing empathy, and providing a safe and supportive environment. It is important to listen to their concerns, offer guidance without being overly controlling, and respect their need for autonomy. Parents should also educate their children about physical and emotional changes, promote healthy habits, and encourage them to seek help when needed.
Related Exams
About this Document
4.9K Views
4.76/5 Rating
Nov 15, 2024 Last updated
Document Description: NCERT Solutions - Reaching Age of Adolescence, Class 8, Science for Class 8 2024 is part of Class 8 preparation. The notes and questions for NCERT Solutions - Reaching Age of Adolescence, Class 8, Science have been prepared according to the Class 8 exam syllabus. Information about NCERT Solutions - Reaching Age of Adolescence, Class 8, Science covers topics like and NCERT Solutions - Reaching Age of Adolescence, Class 8, Science Example, for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for NCERT Solutions - Reaching Age of Adolescence, Class 8, Science.
Introduction of NCERT Solutions - Reaching Age of Adolescence, Class 8, Science in English is available as part of our Class 8 preparation & NCERT Solutions - Reaching Age of Adolescence, Class 8, Science in Hindi for Class 8 courses. Download more important topics, notes, lectures and mock test series for Class 8 Exam by signing up for free. Class 8: Reaching Age of Adolescence, Class 8, Science NCERT Solutions
Description
Full syllabus notes, lecture & questions for Reaching Age of Adolescence, Class 8, Science NCERT Solutions - Class 8 | Plus excerises question with solution to help you revise complete syllabus | Best notes, free PDF download
Information about NCERT Solutions - Reaching Age of Adolescence, Class 8, Science
In this doc you can find the meaning of NCERT Solutions - Reaching Age of Adolescence, Class 8, Science defined & explained in the simplest way possible. Besides explaining types of NCERT Solutions - Reaching Age of Adolescence, Class 8, Science theory, EduRev gives you an ample number of questions to practice NCERT Solutions - Reaching Age of Adolescence, Class 8, Science tests, examples and also practice Class 8 tests.
Download as PDF
Explore Courses for Class 8 exam

Top Courses for Class 8

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Related Searches

pdf

,

Previous Year Questions with Solutions

,

Science NCERT Solutions

,

Reaching Age of Adolescence

,

Class 8

,

Viva Questions

,

Important questions

,

practice quizzes

,

Science NCERT Solutions

,

Reaching Age of Adolescence

,

Semester Notes

,

Free

,

Exam

,

Sample Paper

,

Extra Questions

,

Summary

,

ppt

,

video lectures

,

study material

,

MCQs

,

Class 8

,

Science NCERT Solutions

,

Reaching Age of Adolescence

,

shortcuts and tricks

,

Objective type Questions

,

past year papers

,

mock tests for examination

,

Class 8

;
Additional Information about NCERT Solutions - Reaching Age of Adolescence, Class 8, Science for Class 8 Preparation

NCERT Solutions - Reaching Age of Adolescence, Class 8, Science Free PDF Download

The NCERT Solutions - Reaching Age of Adolescence, Class 8, Science is an invaluable resource that delves deep into the core of the Class 8 exam. These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective. With the help of these notes, you can grasp complex subjects quickly, revise important points easily, and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner, allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material, or toppers' notes, this PDF has got you covered. Download the NCERT Solutions - Reaching Age of Adolescence, Class 8, Science now and kickstart your journey towards success in the Class 8 exam.

Importance of NCERT Solutions - Reaching Age of Adolescence, Class 8, Science

The importance of NCERT Solutions - Reaching Age of Adolescence, Class 8, Science cannot be overstated, especially for Class 8 aspirants. This document holds the key to success in the Class 8 exam. It offers a detailed understanding of the concept, providing invaluable insights into the topic. By knowing the concepts well in advance, students can plan their preparation effectively. Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.

NCERT Solutions - Reaching Age of Adolescence, Class 8, Science Notes

NCERT Solutions - Reaching Age of Adolescence, Class 8, Science Notes offer in-depth insights into the specific topic to help you master it with ease. This comprehensive document covers all aspects related to NCERT Solutions - Reaching Age of Adolescence, Class 8, Science. It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation. Practice papers and question papers enable you to assess your progress effectively. Additionally, the paper analysis provides valuable tips for tackling the exam strategically. Access to Toppers' notes gives you an edge in understanding complex concepts. Whether you're a beginner or aiming for advanced proficiency, NCERT Solutions - Reaching Age of Adolescence, Class 8, Science Notes on EduRev are your ultimate resource for success.

NCERT Solutions - Reaching Age of Adolescence, Class 8, Science Class 8 Questions

The "NCERT Solutions - Reaching Age of Adolescence, Class 8, Science Class 8 Questions" guide is a valuable resource for all aspiring students preparing for the Class 8 exam. It focuses on providing a wide range of practice questions to help students gauge their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation. The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level. Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.

Study NCERT Solutions - Reaching Age of Adolescence, Class 8, Science on the App

Students of Class 8 can study NCERT Solutions - Reaching Age of Adolescence, Class 8, Science alongwith tests & analysis from the EduRev app, which will help them while preparing for their exam. Apart from the NCERT Solutions - Reaching Age of Adolescence, Class 8, Science, students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc. The EduRev App will make your learning easier as you can access it from anywhere you want. The content of NCERT Solutions - Reaching Age of Adolescence, Class 8, Science is prepared as per the latest Class 8 syllabus.
© EduRev
Education Revolution
Follow Us
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup