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 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.
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 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. 1cm, during the 1st week.
g) At the end of the 2nd week, the heights of both plants were the same i.e. 7 cm.
☛ 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
☛ Related Questions:
- The following graph shows the temperature forecast and the actual temperature for each day of a week. a) On which days was the forecast temperature the same as the actual temperature? b) What was the maximum forecast temperature during the week?
- Use the tables below to draw linear graphs. a) The number of days a hill side city received snow in different b) Population(in thousands) of men and women in a village in different years.
- A courier-person cycles from a town to a neighbouring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graph. a) What is the scale taken for the time axis?
- Can there be a time-temperature graph as follows? Justify your answer.