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10. Reaching the age of adolescence Science class 8 in English Medium ncert book solutions Text Book Exercise
10. Reaching the age of adolescence Text Book Exercise – Complete NCERT Book Solutions for Class 8 Science (English Medium). Get all chapter explanations, extra questions, solved examples and additional practice questions for 10. Reaching the age of adolescence Text Book Exercise to help you master concepts and score higher.
10. Reaching the age of adolescence Science class 8 in English Medium ncert book solutions Text Book Exercise
NCERT Solutions for Class 8 Science play an important role in helping students understand the concepts of the chapter 10. Reaching the age of adolescence clearly. This chapter includes the topic Text Book Exercise , which is essential from both academic and examination point of view. The solutions provided here are prepared strictly according to the latest NCERT syllabus and follow the guidelines of CBSE to ensure accuracy and relevance. Each question is explained in a simple and student-friendly manner so that learners can grasp the concepts without confusion. These NCERT Solutions are useful for regular study, homework help, and exam preparation. All textbook questions are solved step by step to improve problem-solving skills and conceptual clarity. Students of Class 8 studying Science can use these solutions to revise important topics, understand difficult questions, and practise effectively before examinations. The chapter 10. Reaching the age of adolescence is explained in a structured way, making it easier for students to connect the theory with the topic Text Book Exercise . By studying these updated NCERT Solutions for Class 8 Science, students can build a strong foundation, boost their confidence, and score better marks in school and board exams.
10. Reaching the age of adolescence
Text Book Exercise
Exercise
1. What is the term used for secretions of endocrine glands responsible for changes taking place in the body?
Answer : The term used for secretions of endocrine glands is hormoane which is responsible for various changes taking place in the body.
2. Define adolescence.
Answer : The period of life when the body undergors changes, leading to reproductive maturity, is called adolescence.
3. What is menstruation? Explain.
Answer : When the uterus receives the egg and it is fertilized, pregnacy occurs. If fertilization does not occur, the released egg and the thickened lining of the uterus along with its blood vesssels are shed off. This causes bleeding in women which is called menstruation.
4. List changes in the body that take place at puberty.
Answer : The onset of puberty brings about :
(i) Growth of the reproductive organs which begin to function. (ii) Hair grows at various places of the body. Breasts develop in girl and facial hair (moustache and beard) apper in boys.
(iii) Voice of the boys becomes hoarse as voice box enlarges during adolescence.
5. Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.
Answer:
| Name of endocrine glands | Hormones secreted |
| testes | Testosterone |
| Ovary | Estrigen |
| Adrenal | Adrenalin |
| Thyroid glands | Thyroxine |
| Pituitary | FSH or Fillicle atimulating hormonre |
| Pancreas | Insulin |
6. What are sex hormones? Why are they named so? State their function.
Answer:
Hormones secreted by testes and ovaries are termed as sex-hormones.
They are named so because they are secreted by the reproductive organs.
Function of sex-hormones:
They hormones are responsible for the secondary sexual charaters of male and female.
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 starts.
(ii) breasts start developing.
(iii) body weight increases.
(iv) height increases.
(c) The right meal for adolescents consists of
(i) chips, noodles, coke.
(ii) chapati, dal, vegetables.
(iii) rice, noodles and burger.
(iv) vegetable cutlets, chips and lemon drink.
Answer:
(a) (ii), (b) (i), (c) (ii).
8. Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby.
Answer:
(a) Adam's apple: In human males, the larynx grows larger during puberty and can be seen as a protruding part of the throat. This protrusion is known as the Adam's apple. In boys, under the influence of sex hormones, the larynx becomes prominent, As a result, the vocal cords become longer and thicker, causing the voice to become hoarse.
Concept insight: At puberty, boys develop a larger voice box called Adam's apple.
(b) Secondary sexual characters are those features that help in distinguishing the male and the female body from each other. They are physical or behavioral characteristics that appear in humans at the time of puberty.
Secondary sexual characters in boys:
(i) Appearance of moustache and beard.
(ii) Appearance of chest hair.
(iii) Growth of hair in genital area and other parts of the skin.
Secondary sexual characters in girls:
(i) Increase in breast size and darkening of the skin of nipples present at the tip of the breasts.
(ii) Growth of hair in genital area and other body parts.
Concept insight: Secondary sexual characters are developed during puberty.
(c) Sex determination in an unbom baby:
The sex of a baby is determined by the type of male gamete that fuses with the female gamete.
9. word game : Use the clues to work out the words.
Across
3. Protruding voice box in boys
4. Glands without ducts
7. Endocrine gland attached to brain
8. Secretion of endocrine glands
9. pancreatic hormons
10. female hormone
Down
1. Male hormone
2. Secretes thyroxine
3. Another therm for teenage
5. Hormone reaches here through blood stream
6. Voice box
7. Term for changes at adolescence
Answer:
See other sub-topics of this chapter:
1. Chapter Review 2. Text Book Exercise 3. Text Book Exercise 4. Addtional - Question 5. Additional Questions With Solutions