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Reaching The Age of Adolescence
Write notes on— (a) Adam’s apple. (b) Secondary sexual c...

Write notes on— (a) Adam’s | Class 8 Science Chapter Reaching The Age of Adolescence, Reaching The Age of Adolescence NCERT Solutions

Welcome to the NCERT Solutions for Class 8 Science - Chapter Reaching The Age of Adolescence. This page offers a step-by-step solution to the specific question from Exercise 1, Question 8: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 8:

Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby.

Answer:

(a) Adam’s apple:

During the puberty, the larynx grows larger in male in human beings. It can be seen as a protruding part of the throat. This is called as Adam’s apple. Larynx becomes prominent in boys because of sex hormones. Due to which the vocal cords becomes longer and thicker which leads to a hoarse voice. However, the larynx is of small size in females and it is hardly visible. Girls have a high pitched voice because of the smaller size of the larynx.

(b) Secondary sexual characters:

Sex hormones are responsible for secondary sexual characters in males and females. Males and females are distinguished by the sexual characters. At the time of puberty, the secondary sexual characters are the physical and behavioral changes that appears in humans.

Secondary sexual characters that are appears in boys are as follows:

Growth of beard
Appearance of chest hair
Growth of hair in genital area and other part of the skin as well.

Secondary sexual characters that are appears in females are as follows:

Increase in the size of breast
Growth of hair in genital areas and other parts of the skin too.
Voice becomes soft and high pitched. (c) Sex determination in an unborn baby:

The sex of the baby is determined by the male gamete that fuses with the female gamete.

23 pairs of chromosomes are present in humans. Out of these pair, the last pair is known as the sex chromosomes.

Male have XY sex chromosome and male gamete can be of two types:

22 + X ; 22 + Y

Whereas female has XX chromosomes and type of female gamete:

22 + X

; X is responsible for a baby girl.

Y is responsible for a baby boy.

crosses

Other Questions of Chapter Reaching The Age of Adolescence

What is menstruation? Explain.

Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.

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 hormone
10. Female hormone

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

List changes in the body that take place at puberty.

What is the term used for secretions of endocrine glands responsible for changes taking place in the body?

What are sex hormones? Why are they named so? State their function.

Define adolescence.

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.

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?

Popular questions of class 8 Science

Describe with the help of a diagram an instrument which can be used to detect a charged body.

Sketch larynx and explain its function in your own words.

Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.

Make a labelled diagram of a candle flame.

What is metamorphosis? Give examples.

The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

Describe the construction of a kaleidoscope.

Make sketches of animal and plant cells. State three differences between them.

What is a constellation? Name any two constellations.

Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.

Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.

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Fill in the blanks:

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float, water, crop, nutrients, preparation

(a) The same kind of plants grown and cultivated on a large scale at a place is called _____________.
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Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Reaching The Age of Adolescence.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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