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Adolescence

Question 25 O...

Question

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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Solution

(a) The red line represents the height of boys
(b) The blue line represents the height of girls
(c) At the onset of puberty, girls grow faster in height than the boysbut they slow down by the age of 16, the boys however continue to grow till they are 18. By the age of 18 years, approximately both reach their maximum height
(d) No, the rate of growth in height varies among individuals. Some may grow in height suddenly at puberty and then slow down, while others may grow gradually.

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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 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)?

Q. 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]

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. 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)

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