The table below shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs? [5 MARKS]

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Solution

Table: 3 Marks
Conclusion: 2 Marks

The graph depicts the relation between the age and height of both boys and girls. During puberty, there is a sudden increase in height of both boys and girls. On the basis of the above graph, it can be observed that during the age of 4-8 years, girls have less height as compared to boys. However, as soon as girls reach 12- 13 years, their height shows a sudden increase and becomes more than boys. In later years, growth in both sexes becomes stable. Growth during puberty is under the control of hormones.

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Q. The following table shows the percentage of students who dropped out of school after completing high school

Age (in Year)	8	9	10	11	12	13	14	15	16	17	18
Boys	72%	75%	78%	81%	84%	88%	92%	95%	98%	99%	100%
Girls	77%	81%	84%	88%	91%	95%	98%	99%	99.5%	100%	100%

Now, use the graph to answer the following question:
(i) In which year both boys and the girls achieve their maximum height?
(ii) Who grows faster at puberty (14 years to 16 years of age)

Q. Question 74(ii)
The following chart gives the growth in height in terms of percentage of full height of boys and girls with their respective ages.

\begin{matrix} A g e (i n Y e a r s) & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 & 16 & 17 & 18 B o y s (i n p e r c e n t a g e) & 72 & 75 & 78 & 81 & 84 & 88 & 92 & 95 & 98 & 99 & 100 G i r l s (i n p e r c e n t a g e) & 77 & 81 & 84 & 88 & 91 & 95 & 98 & 99 & 99.5 & 100 & 100 \end{matrix}

Draw the line graph of above data on the same sheet and answer the following questions.
Who grows faster at puberty (14 years to 16 years of age)?

The table below shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs?

Age (Years)	Height (cm)
Age (Years)	Boys Girls
0	53	53
4	96	92
8	114	110
12	129	133
16	150	150
20	173	165

Q. Question 74(i)
The following chart gives the growth in height in terms of percentage of full height of boys and girls with their respective ages.

\begin{matrix} A g e (i n Y e a r s) & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 & 16 & 17 & 18 B o y s (i n p e r c e n t a g e) & 72 & 75 & 78 & 81 & 84 & 88 & 92 & 95 & 98 & 99 & 100 G i r l s (i n p e r c e n t a g e) & 77 & 81 & 84 & 88 & 91 & 95 & 98 & 99 & 99.5 & 100 & 100 \end{matrix}

Draw the line graph of above data on the same sheet and answer the following questions.
In which year both the boys and the girls achieve their maximum height?

Q. Question 25
Observe the chart and graph given in Fig. 10.3 carefully and answer the following questions.

(a) Which of the line represents the height of boys?
(b) Which line represents the height of girls?
(c) What is the difference between the pattern of increase in the height of boys and girls?
(d) Is this pattern true for each individual?

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