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