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. For the metamorphosis of tadpoles which of the following elements must be available in water? Iodine Carbon Sulphur Chlorine None 3. Structures present in a cell which is responsible for determination of the sex of a baby is nucleus cell membrane cytoplasm chromosome None 4. Deficiency of which hormone cause diabetes? Testosterone Estrogen Insulin Thyroxin None 5. Larynx is called None of these Voice box Respiratory organ Music box None 6. Which of the following is a female hormone? Testosterone Insulin Growth hormone Estrogen None 7. Which of the following statements is true? Boys reach puberty at an earlier age than girls. At the end of rapid growth, girls are normally heavier than boys. Between the age of 4 to 12, girls grow faster than boys. Girls reach puberty earlier than boys. None 8. Glands without ducts Exocrine gland Mammary gland Endocrine glands Pancreatic gland None 9. Insulin controls the blood _________ levels. Platelets Salt Sugar WBC None 10. AIDS can spread from an infected person to another person through sharing comb. blood transfusion. mosquito bite. sharing food. 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. 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 Puberty Metamorphosis None 13. Thyroxin produced by Adrenal gland Thyroid gland Testes Pituitary gland None 14. Given below are events that lead to pregnancy and development of embryo. Fertilisation of egg Maturation of egg Release of egg Embedding of embryo in thickened uterine wall Which of the following options gives the correct order of sequence in which they occur? (i), (ii), (iii), (iv) (i), (iv), (ii), (iii) (ii), (iii), (i), (iv) (ii), (i), (iii), (iv) None 15. The period of maturity of reproductive organs is called. Adolescene period Gestation period Mensuration None of these None 16. In a frog, the process of metmorphosis is controlled by thyroxine, the hormone produced by____________. Thyroid Testes Adrenal None of the above None 17. Which gland release insulin hormone? Pancreas Liver Pituitary Thyroid None 18. What causes changes in females at the time of puberty? Sex hormones Enzymes Nutrients Sex cells None 19. The most conspicuous visible change that occurs in boys during puberty is increased sweating. production of sperms. development in voice box. increase in height. None 20. Metamorphosis in insects is controlled by ____________ hormones. Insect None of the above Adrenal Pituitary 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 comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
