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the tallest and who might be the shortest in your class. Paheli and Boojho realised that sudden increase in height and Age in % of full height hairy line above the lips Years Boys Girls in boys were signs of adolescence. They 8 72% 77% wanted to know more about other changes at 9 75% 81% puberty. 10 78% 84% 11 81% 88% 12 84% 91% 7.2 Changes at Puberty 13 88% 95% Increase in Height The most conspicuous change during 14 92% 98% puberty is the sudden increase in 15 95% 99% height. At this time the long bones, that is, the bones of the arms and the legs 16 98% 99.5% elongate and make a person tall. 17 99% 100% Activity 7.1 18 100% 100% The following chart gives the average rate of growth in height of boys and girls with age. The figures Calculation for full height (cm) in columns 2 and 3, give the percentage of the height a person Presentheight(cm) has reached at the age given in × 100 % of fullheight atthisage column 1. For example, by the age (as given in the chart) 11, a boy has reached 81% of his probable full height, while a girl Example: has reached 88% of her full A boy is 9 years old and 120 cm height. These figures are only representative and there may be tall. At the end of the growth period individual variations. he is likely to be Use the Table for your friends and work out how tall they are likely 120 ×100 cm = 160 cm tall to be. Find out who is likely to be 75 80 SCIENCE 2024-25