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