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