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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 Grap - CBSE Class 8 - Mathematics

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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.

1) How high was Plant A after (a) 2 weeks (b) 3weeks?

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

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

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

5) During which week did Plant A grow most?

6) During which week did Plant B grow least?

7) Were the two plants of the same height during any week shown here? Specify.

Solution

1)

a. After 2 weeks, the height of plant A was 7 cm.

b. After 3 weeks, the height of plant A was 9 cm.

2)

a. After 2 weeks, the height of plant B was 7 cm.

b. After 3 weeks, the height of plant B was 10 cm.

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

4) Growth of plant B from the end of the 2nd week to the end of the 3rd week 

= 10 cm − 7 cm = 3 cm

5) 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.

6) 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.

7) At the end of the 2nd week, the heights of both plants were same.

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Mathematics Textbook for Class 8 (2018 to Current)
Chapter 15: Introduction to Graphs
Ex. 15.10 | Q: 3 | Page no. 237
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 Grap Concept: Concept of a Line Graph.
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