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