1 Look at Table 7.2, which shows the amount of growth hormone secreted by the pituitary gland at different ages.
Table 7.2 Amount of growth hormone secreted by the pituitary gland at different ages
Age Growth hormone (micrograms)
10 1 900
20 600
30 350
40 300
50 250
60 200
70 175
80 170
90 150
2 Plot a line graph to show the change in the amount of growth hormone secreted with age.
3 Describe the shape of the graph.
To plot the line graph, we will use the age as the x-axis and the amount of growth hormone secreted as the y-axis. The data on the table can be plotted as points on the graph.
Age (x-axis):
10, 20, 30, 40, 50, 60, 70, 80, 90
Growth Hormone (y-axis in micrograms):
1900, 600, 350, 300, 250, 200, 175, 170, 150
Connecting these points will give us the line graph representing the change in growth hormone secretion with age.
3. The shape of the graph is a declining line. As age increases, the amount of growth hormone secreted decreases. The decline is not steady throughout the entire age range, but rather shows a relatively steep decrease from 10 to 30 years old, followed by a more gradual decline from 30 to 90 years old.