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 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 3^rd week?

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

Answer 1

(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 3^rd week = 9 cm − 7 cm = 2 cm

(d) Growth of plant B from the end of the 2^nd week to the end of the 3^rd week

= 10 cm − 7 cm = 3 cm

(e) Growth of plant A during 1^st week = 2 cm − 0 cm = 2 cm

Growth of plant A during 2^nd week = 7 cm − 2 cm = 5 cm

Growth of plant A during 3^rd week = 9 cm − 7 cm = 2 cm

Therefore, plant A grew the most, i.e. 5 cm, during the 2^nd week.

(f) Growth of plant B during 1^st week = 1 cm − 0 cm = 1 cm

Growth of plant B during 2^nd week = 7 cm − 1 cm = 6 cm

Growth of plant B during 3^rd week = 10 cm − 7 cm = 3 cm

Therefore, plant B grew the least, i.e. 1 cm, during the 1^st week.

(g) At the end of the 2^nd week, the heights of both plants were same.