Reaching the Age of Adolescence HOTS Reaching the Age of Adolescence multiple choice Questions

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1 HOTS 1. When do noticeable changes begin in human in adolescence? 2. Do both girls and boys grow on same rate? 3. Name female hormone. 4. What is menopause? 5. What are chromosomes? 6. What is the name of hormone produced by pancreas? 7. Which endocrine gland produces the growth hormone? 8. What do you mean by metamorphosis? 9. What is the most important change marked by puberty? 10. Explain the development of sex organs in men and female. 11. What happens when egg gets fertilized? 12. Name the virus that causes AIDS. What are the medium through which this virus is transmitted? 13. Explain the sex determination of a baby in human. 14. What do you understand by Adam s apple? multiple choice Questions 1. Larynx is called a. Voice box b. Music box c. Respiratory organ 2. The egg is a. Egg gamete b. Female gamete c. Both of these 3. Thyroxin produced by a. Pituitary gland b. Adrenal gland c. Thyroid gland d. Testes 4. There are pairs of chromosome in human cell. a. 23 b. 46 c. 22 d. All are wrong

2 5. Initially girls grow than boys. a. Faster b. Slower c. Both of these 6. The period of maturity of reproductive organs is called. a. Adolescene period b. Mensuration c. Gestation period 7. Fertilisation is called a. To produce sperm b. To produce eggs c. Fusion of sperms and eggs d. All of these 8. Puberty age in females is a b c d. More than 14 years 9. The number of chromosomes are present in human cell. a. 22 pairs b. 23 pairs c. 24 parirs d. 26 pairs 10. The male hormone is a. Estragon b. Projestrone c. Testosterone d. All of these Class VIII Math NCERT Solution for QUESTIONS FROM TEXTBOOK Q.1. what is the term used for secretions of endocrine glands responsible for changes taking place in the body? Ans. Hormones. Q.2. Define adolescence. Ans. The period of life, when the body undergoes changes, leading to reproductive maturity is called adolescence. Q.3. What is menstruation? Explain.

3 Ans. When the egg produced by ovary does not get fertilised, the released egg and the thickened lining of the uterus along with its blood vessels are shed off. This causes bleeding in women which is called menstruation. Menstruation occurs once in about 28 to 30 days. Q.4. List the changes in the by that take place at puberty. Ans. The changes in the body of puberty are: (i) Sudden increase in height. (ii) The bones of arms and legs elongate and make a person tall. (iii) Growing of hair at different parts of body. (iv) The voice of a boy gets hoarsed. (v) Development of sex organs. (vi)growth of moustaches and beards in the boys. (vii) The breast in girls develops and hips become wider whereas in boys shoulders generally broaden. Q.5. Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them. Q.6. What are sex hormones? Why are they named so? State their functions. Ans. The hormones which help and control the formation of secondary sexual characters are called sex hormones. They are called sex hormones because they control the sexual activities and help us to distinguish boys from girls. The sex hormones help to delop the secondary sexual characters. Such as, in boys they control formation of sperms by testes and growth of facial hair. In girls they help to develop breasts, milk secreting glands or mammary glands. Q.7. Choose the correct option. (a) Adolescence should be careful about what they eat, because: (i) proper diet develops thcir brains. (ii) proper diet is needed for the rapid growth taking place in their body. (iii) adolescents feel hungry all the time. (iv) testes buds are well deloped in teenagers. (b) Reproductive age in women starts when their: (i) menstruation starts. (ii) breasts start developing. (iii) body weight increasing. (iv) height increases. (c) The right meal for adolescents consists of: (i) chips, noodles, cake. (ii) chapati, dal, vegetable. (iii) rice, noodles and burger. (iv) vegetable cutlets, chips and lemon drink. Ans. (a) (ii) proper diet is needed for the rapid growth taking place in their body. (b) (i) menstruation starts.

4 (c) (ii) chapati, dal, vegetable. Q.8. Write notes on: (a) Adam's apple (b) Secondary Sexual characters (c) Sex determination in unborn baby. Ans. (a) Adam's apple: The protruding part in the throat is called Adam's apple. It is the enlarged voice box or larynx. It makes the voice of boys coarse. (b) Secondary sexual characters: The characters which help to distinguish the male from female are called secondary sexual characters. The characters like hair on chest under arms, development of breast, beard and moustaches are called secondary sexual characters. (c) Sex determination in unborn baby: The sex of unborn baby is determined by the sex chromosomes. An unfertilized egg always has X chromosomes. Sperms are of two types. One contains X chromosomes and the other contains Y chromosomes. If sperm contributes a Y chromosome to the egg at fertilisation, the zygote would develope into male child. If a sperm containing X chromosome fertilises the egg, the zygote would develop into a female. Sample paper Questions 1. What is the age of adolescence in human? 2. Which organ is called voice box? 3. What type of chromosomes occurs in sperms? 4. Name the disease caused by less or not secretion of thyroxin? 5. How we can keep our healthy? 6. Why adolescence is also called teenage? 7. Some boys and girls have disproportionate body structure during adolescence. Why? 8. What are the secondary sexual characters in girls? 9. Explain term menstruation. 10. How do hormones help in the completion of life of insects and frogs? 11. Write some myths which are not facts. 12. Insulin is produced by which gland? TEST 1. What is puberty age? (1) 2. Name the male and female reproductive part. (1) Maximum time: 35 minutes Maximum marks: 22 marks

5 3. Explain the term adolescence in human. (2) 4. What are sex hormones? What are they named so? (2) 5. List the changes that take part at puberty age. (4) 6. What is health? Explain factors which help to keep a good health of an individual. (5) 7. Draw the well labelled diagram of show location of various endocrine glands in human. (3) 8. What do you understand by target site for hormones? (1) 9. What do you mean by menarche? (1) 10. Write factors that affect height of a person. (2) HOTS 1. What are insulators of electricity? 2. Name some substances other than water which conducts electricity? 3. Which effect of current causes the bulb to glow? 4. What is magnetic effect of electric current? 5. What are electrodes? 6. Explain mechanism of glowing bulb? 7. What do you mean by magnetic effect of electricity? 8. Prepare a tester to test conduction based on magnetic effect of the electricity. 9. Name some substances which make the liquids good conductor of electricity. 10. Give two examples of poor conductors of electricity. Multiple choice Questions 1. Plastic wire is a. An insulator b. A conductor c. Both of these 2. Electroplating is based on a. Magnetic effect of electricity b. Chemical effect of electricity c. Heating effect of electricity d. Physical effect of electricity 3. Adding common salt to distilled water makes it a. Good conductor b. Insulator c. No d. Both a and b 4. An electrolyte is

6 a. a metal b. a solution c. a liquid that conducts current d. all of above 5. Copper wire is a a. Good conductor b. Poor conductor c. Both a and b d. None of this 6. Poor conductors are a. Plastics b. Clothes c. Wood d. All of these 7. Distilled water is a. Poor conductor b. Good conductor c. Both a and b d. None 8. Flow of electron is called a. Electroplating b. Electric current c. Electrodes d. Electrolyte 9. Electroplating prevents a. Current b. Chemical effect c. Rusting d. All 10. An electric lamp glows due to a. Chemical effect b. Magnetic effect c. Heating effect d. None Class VIII Science QUESTIONS FROM TEXTBOOK Q.1. Fill in the blanks: (a) Most liquids that conduct electricity are solutions of, and.

7 (b) The passage of an electric current through a solution causes effect. (c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the terminal of the battery. (d) The process of depositing a layer of any desired metal on another metallic object, by means of electricity, is culled. Sample paper Questions 1. Why it is dangerous to touch electrical appliances with wet hands? 2. Name substances which make any liquid good conductor of electricity? 3. Name the part of bulb that glows. 4. Does distilled water conduct electricity? 5. Name the gas deposited on negative electrode. 6. How can you test liquids conduct or do not conduct the electricity? 7. Explain why a bulb glows on passing current. 8. What is chemical effect of electricity? Give some examples of chemical effects. 9. What are the two methods of testing an insulator or conductor? 10. Write true/false a. Rubber is an insulator. b. Electroplating causes rusting. c. Vinegar can conduct electricity. Test Maximum time: 40 minutes Maximum marks: 20 marks 1. What is LED? Write its full form. (2) 2. Write three liquids that conduct electricity. (1) 3. Define electroplating.(1) 4. How will you test the magnetic effect of current? ( 2) 5. Write two useful effects of electroplating?( 2) 6. Write an activity to show that a liquid conducts electricity.( 4) 7. How will you test the chemical effect of electric current? (3) 8. What is a tester? (1) 9. The ordinary water electricity while distilled water does not. Why? (2) 10. Why do we need magnetic compass to test the conduction of electric current? (2)

Class VIII Chapter 10 Reaching the Age of Adolescence Science

Class VIII Chapter 10 Reaching the Age of Adolescence Science Question 1: What is the term used for secretions of endocrine glands responsible for changes taking place in the body? Hormones are chemical substances which are secreted by endocrine glands. They are