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