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