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. For the metamorphosis of tadpoles which of the following elements must be available in water? Chlorine Iodine Carbon Sulphur None 2. Deficiency of which hormone cause diabetes? Thyroxin Estrogen Testosterone Insulin None 3. Insulin controls the blood _________ levels. Sugar Platelets Salt WBC None 4. 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? (ii), (iii), (i), (iv) (ii), (i), (iii), (iv) (i), (ii), (iii), (iv) (i), (iv), (ii), (iii) None 5. Thyroxin produced by Thyroid gland Testes Pituitary gland Adrenal gland None 6. Glands without ducts Pancreatic gland Exocrine gland Endocrine glands Mammary gland None 7. The drastic change that occurs during the life cycle of a frog when it changes from larva to an adult is termed as Metamorphosis Puberty Adulting None of the above None 8. 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. gets one sex chromosome from the mother and the other from the father. develops in the body of the mother. None 9. The period of maturity of reproductive organs is called. None of these Mensuration Gestation period Adolescene period None 10. Which of the following statements is true? Between the age of 4 to 12, girls grow faster than boys. Girls reach puberty earlier than boys. Boys reach puberty at an earlier age than girls. At the end of rapid growth, girls are normally heavier than boys. None 11. What causes changes in females at the time of puberty? Enzymes Nutrients Sex cells Sex hormones None 12. Which gland release insulin hormone? Thyroid Pancreas Pituitary Liver None 13. The most conspicuous visible change that occurs in boys during puberty is increase in height. development in voice box. production of sperms. increased sweating. None 14. In a frog, the process of metmorphosis is controlled by thyroxine, the hormone produced by____________. Thyroid None of the above Adrenal Testes None 15. Larynx is called Respiratory organ None of these Voice box Music box None 16. Structures present in a cell which is responsible for determination of the sex of a baby is nucleus cell membrane cytoplasm chromosome None 17. Metamorphosis in insects is controlled by ____________ hormones. Insect Pituitary Adrenal None of the above None 18. AIDS is a sexually transmitted disease caused by HIV, a _________. Virus Fungi Bacteria Protozoan None 19. AIDS can spread from an infected person to another person through sharing comb. sharing food. mosquito bite. blood transfusion. None 20. Which of the following is a female hormone? Insulin Estrogen Testosterone Growth hormone 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.
