Age in years	% of maximum height (boys)	% of maximum height (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

Using the data from the table given above, the graph has been drawn. Observe the graph and answer the following question.
Which period of age is the fastest-growing period for boys?
 

Using the data from the table given above, the graph has been drawn. Observe the graph and answer the following question.
Who, girls or boys, grows faster? How can you say?

Look at the sequential order of the reproductive stage and answer the questions that follow.
Do the production of ova (eggs) last long in females? State 'Yes' or 'No'.

Fig. Schematic diagram of the menstrual cycle and reproduction.

Look at the sequential order of the reproductive stage and answer the questions that follow.

What would happen if ovulation stops?

Look at the sequential order of the reproductive stage and answer the question that follows.
How does the ovum change after fertilization?