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