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Activity 7.2 There is no need for Paheli to worry. Use the data given in Activity 7.1 to All parts of the body do not grow at the same rate. Sometimes the arms and legs draw a graph. Take age on the or hands and feet of adolescents look X-axis and per cent growth in height oversized and out of proportion with the on the Y-axis. Highlight the point representing your age on the graph. body. But soon the other parts catch up and result in a proportionate body. Find out the percentage of height You must have noticed that height you have already reached. Calculate the height you might eventually of an individual is more or less similar reach. Tally your graph with the one to that of some family member. This is because height depends on the genes given here (Fig. 7.1). inherited from parents. It is, however, very important to eat the right kind of food during these growing years. This helps the bones, muscles and other parts of the body get adequate nourishment for growth. You will find nutritional needs of adolescents discussed later in the lesson. Change in Body Shape Have you noticed that boys in your class have broader shoulders and wider chests than boys in junior classes? This is because they have entered the age of Fig. 7.1 : Graph showing percentage of height with age puberty when shoulders generally broaden as a result of growth. In girls, Initially, girls grow faster than boys the region below the waist becomes but by about 18 years of age, both reach their maximum height. The rate of wider. In boys, the muscles of the body grow growth in height varies in different more prominently than in the girls. individuals. Some may grow suddenly at puberty and then slow down, while Thus, changes occurring in adolescent others may grow gradually. boys and girls are different. Voice Change Did you notice that sometimes the voice of some of the boys in your class cracks? I am worried. Though I have become taller, my At puberty, the voice box or the larynx face looks much smaller begins to grow. Boys develop larger voice compared to my body. boxes. The growing voice box in boys can be seen as a protruding part of the throat REACHING TAGE OFADOLESCENCE 81 2024-25