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