# 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) 3 weeks?

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

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.

**Solution:**

Horizontal axis represents ‘Weeks’ and vertical represents ‘Height’ in cm. We can find the value of ‘Height’ on vertical axis according to the given value of ‘Weeks’ on the horizontal axis

value or vice versa.

(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. 1cm, during the 1st week.

g) At the end of the 2^{nd }week, the heights of both plants were the same i.e. 7 cm.

**ā Check: **NCERT Solutions for Class 8 Maths Chapter 15

**Video Solution:**

## 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

Class 8 Maths NCERT Solutions Chapter 15 Exercise 15.1 Question 3

**Summary:**

From the following graph a) i)7cm ii) 9cm b) i) 7cm ii) 10cm c) 2cm d) 3cm e) 2nd week f) 1st week g) 1st week

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