NCERT Solutions Class 8 Science Chapter 10 Reaching The Age Of Adolescence
NCERT Solutions Class 8 Science Chapter 10 Reaching The Age Of Adolescence: National Council of Educational Research and Training Class 8 Science Chapter 10 Solutions – Reaching The Age Of Adolescence. NCERT Solutions Class 8 Science Chapter 10 PDF Download.
NCERT Solutions Class 8 Science Chapter 10: Overview
Board |
NCERT |
Class |
8 |
Subject |
Science |
Chapter |
10 |
Chapter Name |
Reaching The Age Of Adolescence |
Topic |
Exercise Solutions |
NCERT Solutions Class 8 Science Chapter 10 – Reaching The Age Of Adolescence
CHAPTER: – 10
(REACHING THE AGE OF ADOLESCENCE)
Exercise: –
1) What is the term used for chemical secretions of endocrine glands responsible for changes taking place in the body?
Ans: – The term used for the chemical secretion of endocrine glands is responsible for the changes taking places in the body which is hormone. Hormone secretion is the main reason of the changing of characters and growing of male and female body and reproductive organs.
2) Define adolescence.
Ans: – In adolescence the changes of the body is seen. In this process. The maturity according to the changes body because of the reproduction is seen in this adolescence. With the increasing of the age the changes of characteristics or adolescence happen.
3) What is menstruation? Explain.
Ans: – The mensuration is happened in female from age between the 13 to 40-45 once in every month. This mensuration cycle is the reason behind the development of the body structure in the female reproductive organ. After this starting any female become capable of giving birth.
4) List changes in the body that take place at puberty.
Ans:-The changes in body taking place in puberty is
- Reproductive organ developed.
- Hair growth like beard and moustache.
- Voice box changes.
5) Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.
Ans: –
Endocrine Gland |
Hormone secreted |
Testis | Testosterone |
Ovaries | Estrogen |
Pituitary | GH, TSH, |
Thyroid | PTH |
Adrenal | Adrenalin |
6)What are sex hormones? Why are they named so? State their function.
Ans: – The sex hormone present in the male or female and creates the difference between them and also helps in expressing the maturity as well as developing the reproductive organs.
As these hormones differentiate between male and female these are known as sex hormone. The sex hormone in male body is XY and in female is XX.
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.
Ans: – Option(ii).
Explanations- (As in this process body changes)
(b) Reproductive age in women starts when them
(i) menstruation starts.
(ii) breasts start developing.
(iii) body weight increases.
(iv) height increases.
Ans: -Option(i).
Explanations- (This cycle starts in female from age of 13 and goes upon at the age of 40 to 45)
(c) The right meal for adolescents consists of
(i) chips, noodles, coke.
(ii) chapatti, dal, vegetables.
(iii) rice, noodles and burger.
(iv) vegetable cutlets, chips and lemon drink.
Ans: – Option(ii).
Explanations- (As in this time body building food is necessary)
8) Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby.
Ans: – (a)The voice of the men changes because of the hormone are secretion and then become mature in that case the throats protruding parts is known as Adam’s apple.
(b)The secondary character’s which is seen in the male body is the growing of the beard, voice become hoarse and in the female the breast developed.
(c)The sex chromosome present in the male is XY and in the female is XX. So, the unborn will have XX or XY as chromosome X gets from mothers and X or Y gets from father.
9) Word game: Use the clues to work out the words.
Across
- Protruding voice box in boys
- Glands without ducts
- Endocrine gland attached to brain
- Secretion of endocrine glands
- Pancreatic hormone
- Female hormone
Down
- Male hormone
- Secretes thyroxine
- Another term for teenage
- Hormone reaches here through blood stream
- Voice box
- Term for changes at adolescence.
Ans: –
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?
Ans: – From the graph it is clear that the population of boys and girls are not in same position as the population of the girls is decreasing as compared to the boys. So, in future the sex ratio will be different which is a bad situation for a society.
Female is XX and male is XY 6th question
Done. Thank You