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Question

Give a suitable word for each of the following statements. [NCERT Exemplar] (i) The site which responds to a hormone (ii) Name of a gland which transports secretions through ducts (iii) Chemicals which control changes at adolescence stage (iv) It marks the beginning of reproductive period

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Observe the given chart and graph carefully and answer the questions that follow. (i) Which of the line represents the height of boys? (ii) Which line represents the height of girls? (iii) What is the difference between the pattern of increase in the height of boys and girls? (iv) Is this pattern true for each individual?
Age in years % of full height
Boys Girls
8 72% 77%
9 75% 81%
10 78% 84%
11 81% 88%
12 84% 91%
13 88% 95%
14 92% 98%
15 95% 99%
16 98% 99.5%
17 99% 100%
18 100% 100%

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