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