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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 by the following graph.
(a) How high was Plant A after (i) 2 weeks (ii) 3weeks?
(b) How high was Plant B after (i) 2 weeks (ii) 3weeks?
(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.
Asked by Pradeep Last Modified
Answer 
Charlie
(a)
(i) After 2 weeks, the height of plant A was 7 cm.
(ii) After 3 weeks, the height of plant A was 9 cm.
(b)
(i) After 2 weeks, the height of plant B was 7 cm.
(ii) After 3 weeks, the height of plant B was 10 cm.
(c) Growth of plant A during 3rd week = 9 cm − 7 cm = 2 cm
(d) Growth of plant B from the end of the 2nd week to the end of the 3rd week
= 10 cm − 7 cm = 3 cm
(e) Growth of plant A during 1st week = 2 cm − 0 cm = 2 cm
Growth of plant A during 2nd week = 7 cm − 2 cm = 5 cm
Growth of plant A during 3rd week = 9 cm − 7 cm = 2 cm
Therefore, plant A grew the most, i.e. 5 cm, during the 2nd week.
(f) Growth of plant B during 1st week = 1 cm − 0 cm = 1 cm
Growth of plant B during 2nd week = 7 cm − 1 cm = 6 cm
Growth of plant B during 3rd week = 10 cm − 7 cm = 3 cm
Therefore, plant B grew the least, i.e. 1 cm, during the 1st week.
(g) At the end of the 2nd week, the heights of both plants were same.
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