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