Students may better prepare for the Class 10 board exams by using the material provided in the NCERT Solutions Science. This knowledge is extremely crucial as it assists students in better comprehending difficult subject matter. Checking how well you understand a certain subject by reading the solutions to the questions asked in the textbook is a great way to figure out where your knowledge is strongest and where it needs improvement. Our subject matter specialists have designed these NCERT Solutions for Class 10 Science in such a manner that the students will have a much better understanding of all of the subjects that are included in the curriculum for CBSE Class 10 Science.
Students are able to create a strong conceptual basis with the help of the NCERT Solutions PDFs available at SWC. This base plays a key part in the students’ preparation for the latter phases of the competitive examinations. We give comprehensive answers to challenges posed by NCERT in accordance with the methodology provided by CBSE. The students are able to effortlessly prepare all of the ideas that are presented in their respective courses better and more successfully, and they are even able to succeed in passing the most difficult competitive examinations, such as JEE Main, JEE Advanced, NEET, AIMS, and so on.
Your academic journey begins a new stage as you reach the eighth grade, and a new facet of learning awaits you. This is the year where pupils begin to acquire an interest in the topic at hand, and it is also the year in which you choose whether you will study business, humanity, or science in the following year (class 12). As a consequence of this, having a solid foundation of knowledge in fields such as mathematics and physics comes highly recommended. The NCERT textbook for class 8 is the greatest book now available on the market for enhancing one’s education in the areas of mathematics and science. Read up on the theory that is presented in the book for grade 8 and answer all of the questions that are posed in the practice section of the NCERT textbook.
When working through the exercises in the NCERT textbook, if you run into any type of difficulty or uncertainty, you may use the swc NCERT Solutions for class 8 as a point of reference. While you are reading the theory form textbook, it is imperative that you always have notes prepared. You should make an effort to understand things from the very beginning so that you may create a solid foundation in the topic. Use the NCERT as your parent book to ensure that you have a strong foundation. After you have finished reading the theoretical section of the textbook, you should go to additional reference books.
NCERT SOLUTION FOR CLASS 8 SCIENCE CHAPTER 10 REACHING THE AGE OF ADOLESCENCE – Exercises
Question 1. What is the term used for secretions of endocrine glands responsible for changes taking place in the body?
Solution : The term used for secretion of endocrine glands is hormones, which is responsible for various changes taking place in the body.
Question 2. Define adolescence.
Solution : The period of life when the body undergoes changes, leading to reproductive maturity, is called adolescence.
Question 3. Define Menstruation.
Solution : The process of shedding of the uterine lining on regular monthly basis is called as menstruation. It starts at puberty and in the reproductive cycle of the female body. The uterus prepares itself to receive a fertilized egg on every month. Due to this the inner lining of the uterus become thick and is supplied with blood to nourish the embryo. If the egg is not fertilized, then the lining of the uterus breaks down and get released in form of blood through vagina. The time period of this is about 2 to 8 days every month. This monthly cycle is known as menstrual cycle.
Question 4. At the time of puberty what are the changes that takes place?
The changes that take place at the time of puberty are as follows:
a) The height and weight of the body will suddenly increases
b) The hair seems to be appear in the area such as legs, hands, face and underarms
c) In female the enlargement of the ovary takes place and starts producing matured eggs and on the other hand in males the testis grows and starts producing sperms
d) In males the shoulder broadens and chest become widen, whereas in females the region below the waist become wider.
e) The acne is seems to appear because of the excessive secretion of the oil from the skin.
f) In boys, the larynx become prominent under the influence of hormones, the vocal cord become longer and thicker. Due to this change causes the voice to become hoarse.
Question 5. Draw a table that shows the name of the endocrine glands and the hormones secreted by them.
Question 6. What do you mean by the sex hormones? Why are the called so and state their function.
Solution : Sex hormones are chemical substances produced by sex organs. For example, testosterone is the male sex hormone produced by the testis, and oestrogen is the female sex hormone produced by the ovary. These hormones are secreted by sex organs and affect the sexual features of an organism. Hence, they are known as sex hormones.
Functions of sex hormones:
Testosterone: This hormone brings about secondary sexual characters in boys such as the growth of a beard, the voice becoming hoarse, development of reproductive organs, etc.
Oestrogen: This hormone is responsible for the development of secondary sexual characters in females such as the enlargement of breasts, development of female reproductive organs, etc.
Question 7. Choose the correct option.
(a) Adolescents should be careful about what they eat, because
(i) Proper diet develops their brains.
(ii) Proper diet is needed for the rapid growth taking place in their body.
(iii) Adolescents feel hungry all the time.
(iv) Taste buds are well developed in teenagers.
(b) Reproductive age in women starts when their
(i) Menstruation start.
(ii) Breast start developing
(iii) Body weight increases
(iv) Height increases.
(c) The right meal for adolescents consist of
(i) Chips, noodles, coke.
(ii) Chapatti, dal, vegetables.
(iii) Rice, noodles and burger.
(iv) Vegetables cutlets, chips and lemon drink.
(a) (ii) Proper diet is needed for the rapid growth taking place in their body.
(b) (i) menstruation starts.
(c) (ii) Chapatti, dal, vegetables.
Question 8. Write notes on-
(a) Adam’s apple.
(b) Secondary sexual charecters.
(c) Sex determination in unborn baby.
(a) Adam’s apple: At puberty, the voice box or the larynx begins to grow. The growing voice box in boys can be seen a protruding part of the throat called Adam’s apple.
(b) Secondary sexual characters: Those changes that take place at puberty in boys and girls are called secondary sexual characters. In includes increase in size of breast in girls and pubic hairs around genital organ in girls. In boys facial hair and cracking of voice are secondary sexual features.
(c) Sex determination in the unborn baby: Human beings have 23 pairs of chromosome. One pair of male (XY) and one pair of chromosome in female (XX) are called sex chromosome. Male produce two types of gametes half containing X chromosome and half containing Y chromosome. When the sperm containing Y chromosome fuse with egg the sex of baby is male and when X chromosome containing sperm fertilse the egg the sex of baby is female.
Question 9. Word game: use the clues to work out the words.
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
1. Male hormone
2. Secretes thyroxin
3. Another term for teenage
5. Hormone reaches here through blood stream
7. Term for changes at adolescence
3. Adam’s apple
4. Target site
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?
Age Height (cm)
(Years) Boys Girls
0 53 53
4 96 92
8 114 110
12 129 133
16 150 150
20 173 165
Following are the conclusions which can be drawn from the graph:
(i) As the age increases, there is an increase in the height of both boys and girls.
(ii) Until 0 – 8 years, girls have less height in comparison to that of boys.
(iii) However from 12 – 16 years, there is sudden increase in the height of girls and becomes more than the boys.
(iv) At age of 20, boys are taller than girls.
Conclusions for NCERT SOLUTION FOR CLASS 8 SCIENCE CHAPTER 10 REACHING THE AGE OF ADOLESCENCE
Lacking a solid understanding of scientific principles might have unimaginable repercussions. The NCERT textbook for class 8 science comes highly recommended by a number of different educators. You will not only be able to improve your academic performance by using the appropriate combination of NCERT textbooks and NCERT answers for class 8 science chapter 10 but you will also be able to establish a strong foundation in science. The NCERT answers that were generated by the SWC team are among the finest solutions that are currently accessible on the web.