CBSE Class 8 Science Reaching The Age Of Adolescence Worksheet

Read and download free pdf of CBSE Class 8 Science Reaching The Age Of Adolescence Worksheet. Students and teachers of Class 8 Science can get free printable Worksheets for Class 8 Science Chapter 10 Reaching the Age of Adolescence in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 8 students should practice questions and answers given here for Science in Class 8 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 8 Science Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems with solutions on daily basis to get more score in school exams and tests

Worksheet for Class 8 Science Chapter 10 Reaching the Age of Adolescence

Class 8 Science students should refer to the following printable worksheet in Pdf for Chapter 10 Reaching the Age of Adolescence in Class 8. This test paper with questions and answers for Class 8 will be very useful for exams and help you to score good marks

Class 8 Science Worksheet for Chapter 10 Reaching the Age of Adolescence

Question. Define adolescence.
Answer: The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence. The period of adolescence is normally 11 years to 19 years.

Question. What is menstruation? Explain.
Answer: The cyclic flow of blood and mucus along with inner lining of uterus in case of not fertilization of egg from the female body is called menstruation. Each month uterus prepares itself to receive the fertilized egg. If fertilization do not occurs the inner ling breaks away and comes out through vagina for 3-5 days.

Question. What is the term used for secretions of endocrine glands responsible for changes taking place in the body?
Answer: Hormones.

Question. 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 growth at various places of the body. Breasts develop in girls and facial hairs appear in boys.
(iii) Voice of the boys becomes hoarse as voice box enlarges during adolescence.

Question. Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them.
Answer: 
cbse-class-8-science-reaching-the-age-of-adolescence-worksheet-set-b

Question. What are sex hormones? Why are they named so? State their function.
Answer: The chemical substances produced by the sex organs are called sex hormones. They are named so because they control the sexual activities and are secreted by males and females separately.
Estrogen: This hormone is responsible for the development of secondary sexual characters in females like enlargement of breasts, development of female reproductive organs etc.
Testosterone: this hormone brings the secondary sex character in boys such as the growth of beard, the voice becomes hoarse, development of the reproductive organs etc.

Choose the correct option.

Question. The right meal for adolescents consists of
(a) chips, noodles, coke.
(b) chapati, dal, vegetables.
(c) rice, noodles and burger.
(d) vegetable cutlets, chips and lemon drink.
Answer: B

Question. Adolescents should be careful about what they eat, because:
(a) proper diet develops their brains.
(b) proper diet is needed for the rapid growth taking place in their body.
(c) adolescents feel hungry all the time.
(d) taste buds are well developed in teenagers.
Answer: B

Question. Reproductive age in women starts when their
(a) menstruation starts.
(b) breasts start developing.
(c) body weight increases.
(d) height increases.
Answer: A

Question. Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby.
Answer: (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 characters which are visible more apparently and help in distinguishing a male from a female are called secondary sexual characters. For example, in girls, breasts and in boys facial hairs i.e., moustache and beard.
(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. 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. 
cbse-class-8-science-reaching-the-age-of-adolescence-worksheet-set-b

Question. Word game : Use the clues to work out the words.
Across
3. Protruding voice box in boys -- Adam’s apple
4. Glands without ducts -- Endocrine
7. Endocrine gland attached to brain -- Pituitary
8. Secretion of endocrine glands -- Hormone
9. Pancreatic hormone -- Insulin
10. Female hormone -- Estrogen
Down
1. Male hormone -- Testosterone
2. Secretes thyroxine -- Thyroid
3. Another term for teenage -- Adolescence
5. Hormone reaches here through blood stream -- Target site
6. Voice box -- Larynx
7. Term for changes at adolescence – Puberty.  


cbse-class-8-science-reaching-the-age-of-adolescence-worksheet-set-b

L-10

Reaching the age of Adolescence

1. After studying the following diagram, determine the sex of the child

""CBSE-Class-8-Science-Reaching-The-Age-Of-Adolescence-Worksheet-Set-B

2. Complete following table :
   Hormone                     Gland secreting the hormone
Thyroxine .........................................
......................................... Pancreas
Growth Hormone ........................................
......................................... Testis
Estrogen ........................................

3. Fill in the blanks -

i) Reaching the age of adolescence, the protruding part of the throat in boys is called ____________.

ii) Hormone secreted by testis is _________________.

iii) Stoppage of menstruation is called _________________.

iv) Pituitary gland secretes a hormone _____________. responsible for the growth.

4. Write any three secondary sexual characters in boys and girls on reaching the age of adolescence.
Boys                                             Girls
i) ................................... ....................................
ii) ................................... ....................................
iii) ................................... ....................................

5. During the period of adolescence, children should eat which type of food and which not.
        Should eat                        Should be avoided
i) .................................   1) .........................................
ii) .................................  2) .........................................
iii) ................................. 3) .........................................
iv) ................................. 4) .........................................
Fruits, Burger, Milk, Pizza, Chocolates, Pulses, Chips, Vegetables.

6. Write a slogan on junk - food

Q.1 Define the following:
i) adolescence
ii) hormones
iii) puberty
iv) endocrine glands
v) target site
vi) chromosomes
vii) Menstruation
viii) Menarche ix) Menopause

Q.2 Mention the age group for adolescence. Why this period is also called as teenager period?

Q.3 What stage of growth marks the cessation of puberty?

Q.4 Mention some changes that take place in an individual during puberty?

Q.6 At what age human beings attain full height?

Q.7 Comment on the pattern of growth in human beings during puberty.

Q.8 How does intake balanced diet affect the growth of an individual during puberty?

Q9 What are the differences noticed between the growth patterns of boys and girls at the stage of puberty?

Q.10 What is Adam’s apple?

Q11 How is the voice of girls different than that of the boys and why?

Q12 What are sebaceous glands? How are these glands affected during puberty?

Q13 What are the changes that take place in the reproductive organs of the boys and girls during puberty?

Q14 Mention the intellectual and emotional changes that take place in an individual during puberty?

Q15 What do you mean by secondary sexual characteristics? Mention a few of them.

Q16 Name the hormone secreted by testes and ovaries.

Q17 Mention the changes that take place in the endocrine glands of male and female human beings.

Q18 Name the endocrine gland which controls the secretions from other glands.

Q19 What role do hormones play in the onset of puberty?

Q20 Write the main characteristic features of menstrual cycle?

Q21 Mention the changes that take place in the uterus if it receives an unfertilsed egg from the fallopian tube?

Q22 Explain how the sex of an individual is determined?

Q23 Draw a neat diagram to show the location of various endocrine glands in our body.

Q24 What is adrenalin ? What is its funtion?

Q25 Why should we plan the diet of an adolescent with great care?

Q26 Why should a teenager be highly careful about the cleanliness of his/her body?

Q27 Fill in the blanks:

a) Adolescents become capable of reproduction when their --------- and ------- begin to produce gametes

b) In human females th reproductive phase of life begins at---------- and lasts till the age of------- years.

c) -------- no. of chromosomes are present in the human gametes

d) -------- and------- are sex chromosomes.

e) An ovum has -----sex chromosome while a sperm has -----sex chromosome.

f) The gametes posess only ------- set of chromosomes.

g) Human sperms are of --------- types as they carry either --------or-------- sex chromosomes.

h) -------- glands maintain salt balance in the body.

i) Adrenalin is secreted from the ---------- gland.Growth hormone is secreted from the --------- gland.

j) The changre from larva to adult is called---------

k) Deficiency of ----------mineral leads to goiter.

l) ------------ are considered to be protective foods.

Hots and values based -

1. Mrs . Ramesh does not use iodised salt in the food she cooks at home .Mr. Ramesh suggested her to use iodised salt to keep good health of the family.
What values are associated with such suggestion.

2. Rahul goes to gym for a workout everyday. How is it values in his life.

3. Anmol lives near a pond . He always notices tadpoles in the water but no frogs .
What do you think is the reason?

Fill in the blanks :

1.The period of life, when the body undergoes changes, leading to reproductive maturity is called __________.

2.The age at which reproductive organs become functionally active is called _____________.

3.Increase in height occurs during __________.

4._____________ are external characters which are directly not involved in the process of reproduction.

5.The changes which occur during adolescence are controlled by ______________.

6.The hormones are produced in special organ are called _______________.

7.Endocrine glands are also called ______________ glands.

8.In frog metamorphosis is controlled by ______________ hormone.

Answer the following :

1. Name the sex hormone in humans.

2. Name the disease caused due to deficiency of the hormone thyroxine.

3. Name the hormone produced by the adrenal gland.

4. Name the master gland.

5. What are the type of sex hormones produced by males ?

6. How many pairs of chromosomes as human body cell contain ?

Chapter 01 Crop Production and Management
CBSE Class 8 Science Crop Production And Management Worksheet
Chapter 02 Microorganisms: Friend or Foe
CBSE Class 8 Science Micro Organisms Friend And Foe Worksheet
Chapter 03 Synthetic Fibres and Plastics
CBSE Class 8 Science Synthetic Fibers And Plastics Worksheet
Chapter 04 Materials Metals and Non-Metals
CBSE Class 8 Science Materials Metals And Non Metals Worksheet
Chapter 07 Conservation of Plants and Animals
CBSE Class 8 Science Conservation Of Plants And Animals Worksheet
Chapter 08 Cell Structure and Functions
CBSE Class 8 Science Cell Structure And Functions Worksheet
Chapter 10 Reaching the Age of Adolescence
CBSE Class 8 Science Reaching The Age Of Adolescence Worksheet
Chapter 14 Chemical Effects of Electric Current
CBSE Class 8 Science Chemical Effect Of Electric Current Worksheet
Chapter 17 Stars and the Solar System
CBSE Class 8 Science Stars And The Solar System Worksheet
Chapter 18 Pollution of Air and Water
CBSE Class 8 Science Pollution Of Air And Water Worksheet

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