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 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 2. When do girls overtake boys in height? Adolescence Childhood Adulthood Old age None 3. Which of the following pairs of hormones and minerals is associated with the occurrence of goitre? Minerals-Phosphorus, Hormones -Adernaline Minerals - iodine, Hormones -Thyroxine Minerals - calsium, Hormones - Thyroxine Minerals- iron, Hormones -Insulin None 4. Which of the following does not take place during the final stage of the menstrual cycle? Further thickening of the uterine lining. Repair and growth of the uterine lining. Ovulation Both (B) and (C) None 5. Which of the following hormones initiates metamorphosis in insects? Growth hormone Insulin Adrenaline Thyroxine None 6. Why is a diet rich in proteins essential at puberty? protection from diseases the formation of strong bones and teeth For supplying sufficient energy For the formation of new cells during growth None 7. Which of these hormones is secreted by endocrine gland located on the top of kidneys? Insulin Testosterone Progesterone Adrenaline None 8. The menstrual cycle stops in a women at about 50 years old. The woman is said to have reached menarche puberty adolescence menopause None 9. Which chromosomes determine the sex of an individual? Allosomes Autosomes Plasmid Giant chromosomes None 10. Which of the following is called the master gland in the human body? Islets of Langerhans Adrenal Thyroid Pituitary None 11. What causes changes in females at the time of puberty? Enzymes Sex hormones Nutrients Sex cells None 12. A Which of the following processes involves the fusion of a male and female gamete? Insemination Implantation Fertilization Fission None 13. 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? Goitre Cirrohsis of the liver. Diabetes mellitus. Cancer None 14. Which of the following is/are true of secondary sexual characteristics of boys? Growth of facial hair Development of bones and muscles Production of sperms All of these None 15. 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 X, Z, W, Y W, Y, X, Z Z, X, Y, W 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.
