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