Ncert – class 8- science – Chapter 7: Reaching the Age of Adolescence 2 Welcome to your Ncert - class 8- science - Chapter 7: Reaching the Age of Adolescence 2 1. Which of the following is called the master gland in the human body? Islets of Langerhans Thyroid Adrenal Pituitary None 2. Which of the following hormones initiates metamorphosis in insects? Adrenaline Insulin Growth hormone Thyroxine None 3. Which of the following is/are true of secondary sexual characteristics of boys? Growth of facial hair Production of sperms All of these Development of bones and muscles None 4. Which of these hormones is secreted by endocrine gland located on the top of kidneys? Insulin Testosterone Adrenaline Progesterone None 5. A Which of the following processes involves the fusion of a male and female gamete? Fission Fertilization Insemination Implantation None 6. The menstrual cycle stops in a women at about 50 years old. The woman is said to have reached menopause menarche puberty adolescence None 7. The given table has various stages. W - The ovum dies within 24 hours after ovulation. X - The uterus wall thickens with blood vessels. Y - The uterus wall breaks down. Z - The ovary discharges an ovum. Which of these sequence is correct of the menstrual cycle? Y, W, Z, X W, Y, X, Z X, Z, W, Y Z, X, Y, W None 8. Why is a diet rich in proteins essential at puberty? the formation of strong bones and teeth For the formation of new cells during growth For supplying sufficient energy protection from diseases None 9. Arjun kept losing weight even though he was taking his meals regularly. He felt thirsty all the time. When the doctor tested Arjun's urine, the test showed a high concentration of glucose. What disease is Arjun suffering from? Diabetes mellitus. Cirrohsis of the liver. Goitre Cancer None 10. When do girls overtake boys in height? Childhood Old age Adolescence Adulthood None 11. Which chromosomes determine the sex of an individual? Autosomes Plasmid Allosomes Giant chromosomes None 12. Which of the following pairs of hormones and minerals is associated with the occurrence of goitre? Minerals - calsium, Hormones - Thyroxine Minerals- iron, Hormones -Insulin Minerals - iodine, Hormones -Thyroxine Minerals-Phosphorus, Hormones -Adernaline None 13. Which of the following is NOT a secondary sexual characteristic feature of girls? The enlargement of breasts. The growth of hair at armpit. The deepening of voice. The menstruation begins. None 14. Which of the following does not take place during the final stage of the menstrual cycle? Further thickening of the uterine lining. Ovulation Repair and growth of the uterine lining. Both (B) and (C) None 15. What causes changes in females at the time of puberty? Nutrients Sex hormones Enzymes Sex cells 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.
