Ncert – class 8- science – Chapter 7: Reaching the Age of Adolescence 1 Welcome to your Ncert - class 8- science - Chapter 7: Reaching the Age of Adolescence 1 1. The drastic change that occurs during the life cycle of a frog when it changes from larva to an adult is termed as Adulting Metamorphosis Puberty None of the above None 2. Metamorphosis in insects is controlled by ____________ hormones. None of the above Adrenal Pituitary Insect None 3. Larynx is called Voice box Music box None of these Respiratory organ None 4. AIDS is a sexually transmitted disease caused by HIV, a _________. Virus Protozoan Bacteria Fungi None 5. The period of maturity of reproductive organs is called. Adolescene period Gestation period None of these Mensuration None 6. Glands without ducts Pancreatic gland Mammary gland Exocrine gland Endocrine glands None 7. Insulin controls the blood _________ levels. Platelets WBC Sugar Salt None 8. The most conspicuous visible change that occurs in boys during puberty is production of sperms. increased sweating. development in voice box. increase in height. None 9. In a frog, the process of metmorphosis is controlled by thyroxine, the hormone produced by____________. Adrenal Testes None of the above Thyroid None 10. Structures present in a cell which is responsible for determination of the sex of a baby is cell membrane chromosome cytoplasm nucleus None 11. For the metamorphosis of tadpoles which of the following elements must be available in water? Carbon Iodine Chlorine Sulphur None 12. Given below are events that lead to pregnancy and development of embryo. Fertilisation of eggMaturation of eggRelease of eggEmbedding of embryo in thickened uterine wallWhich of the following options gives the correct order of sequence in which they occur? (i), (ii), (iii), (iv) (i), (iv), (ii), (iii) (ii), (iii), (i), (iv) (ii), (i), (iii), (iv) None 13. Which gland release insulin hormone? Liver Thyroid Pancreas Pituitary None 14. Which of the following is a female hormone? Estrogen Insulin Testosterone Growth hormone None 15. Which of the following statements is true? At the end of rapid growth, girls are normally heavier than boys. Boys reach puberty at an earlier age than girls. Between the age of 4 to 12, girls grow faster than boys. Girls reach puberty earlier than boys. None 16. Thyroxin produced by Thyroid gland Pituitary gland Adrenal gland Testes None 17. The belief that the mother is completely responsible for the sex of the child is wrong because the child gets sex chromosome only from the father. gets sex chromosome only from the mother. develops in the body of the mother. gets one sex chromosome from the mother and the other from the father. None 18. Deficiency of which hormone cause diabetes? Estrogen Thyroxin Insulin Testosterone None 19. What causes changes in females at the time of puberty? Sex hormones Sex cells Nutrients Enzymes None 20. AIDS can spread from an infected person to another person through mosquito bite. sharing food. blood transfusion. sharing comb. None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
