Question

For an experiment in Botany, two different plants, plant A and plant B were grown under similar laboratory conditions. Their heights were measured at the end of each week for 3 weeks. The results are shown in the following graph are:

(a) How high was Plant A after (i) 2 weeks or (ii) 3weeks?

(b) How high was Plant B after (i) 2 weeks or (ii) 3 weeks?

(c) How much did Plant A grow during the 3rd week?

(d) How much did Plant B grow from the end of the 2nd week to the end of the 3rd week?

(e) During which week did Plant A grow most?

(f) During which week did Plant B grow least?

(g) Were the two plants of the same height during any week shown here?

Specify.

S T o 2 3 

Answer 1

The following interpretations can be made by analyzing the given graph properly.

(a)

1. The graph shows the plant was 7cm high after two weeks.
2. The graph shows the plant was 9cm high after three weeks.

(b)

1. The graph shows the plant was 7cm high after two weeks.
2. The graph shows the plant was 10cm high after three weeks.

(c)

1. From the graph, we can calculate that plant A grew 2cm during the third week.
2. Growth in the third week = 9 cm–7 cm = 2cm

(d)

1. From the graph, we can calculate that Plant B grew 3cm during the end of the second week and the end of the third week.
2. Growth at the end of the second week = 10cm
3. Growth at the end of the third week = 7cm
4. Growth during the second and third week = 10-7 = 3cm

(e)

1. It can be deduced from the graph that Plant A grew most during the second week.

(f)

1. It can be deduced from the graph that Plant B grew the least during the first week.

(g)

1. Yes, the two plants were of the same height at the end of the second week.
2. Height of Plant A = Height of Plant B = 7cm