In the graph x-axis represents weeks and y-axis represents the heights of the plant.
Scale : On x-axis 7cm=1week
On y-axis 1cm=1cm in height
To find the height of plant at particular week:
Trace the vertical line parallel to y-axis passing from the point on x-axis, find the point where this vertical line intersects the graph. Now from that point trace a horizontal line parallel to x-axis, this line intersects the y-axis at required point.
To find the week at particular height:
Trace the horizontal line parallel to x-axis passing from the height point on y-axis, find the point where this horizontal line intersects the graph. Now from that point trace a vertical line parallel to y-axis, this line intersects the x-axis at required point.
Now, a) Follow step 1 on graph for plant A at point i) 2 weeks and ii) 3 weeks, we get corresponding heights on y-axis, 7cm for 2 weeks and 9cm for 3 weeks.
b) Follow step 1 on graph for plant B at point i) 2 weeks and ii) 3 weeks, we get corresponding heights on y-axis, 7cm for 2 weeks and 10cm for 3 weeks.
c) To find grow during 3rd week, we have to find the height difference between 2nd and 3rd week, which is 9cm - 7cm = 2cm
d) To find grow of plant B from end of 2nd week to end of 3rd week, we have to find height difference between 3rd and 2nd week, 10cm - 7cm = 3cm
e) Find the grow of height level of plant A week-wise
1st week: 1cm - 0cm = 1cm
2nd week: 7cm - 1cm = 6cm
3rd week: 9cm - 7cm = 2cm
so plant A grows on 2nd week the most
f) Find the grow of plant B week-wise
1st week: 2cm - 0cm = 2cm
2nd week: 7cm - 2cm = 5cm
3rd week: 10cm - 7cm = 3cm
so plant B grow least on week 1st
g) Graphs of plant A and plant B intersects at (2nd week and 7cm height), so plants were in same height which is 7cm.