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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

ConceptConcept of a Line Graph

#### 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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