NCERT Class 8 Mathematics Solutions: Chapter 15 – Introduction to Graph Exercise 15.1 Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Definition of Double Line

1. For an experiment in Botany, two different plants, plant and plant were grown under similar laboratory conditions. Their heights were measured at the end of each week for weeks. The results are shown by the following graph.

Graph Shows the Plant a and B՚S Height

(a) How high was Plant after

(i) weeks

(ii) weeks?

(b) How high was Plant after

(i) weeks

(ii) weeks?

(c) How much did Plant grow during the week?

(d) How much did Plant grow from the end of the week to the end of the week?

(e) During which week did Plant grow most?

(f) During which week did Plant grow least?

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

Answer:

(a)

(i) The plant A was high after weeks and

(ii) After weeks it was high.

(b)

(i) Plant was high after weeks and

(ii) After weeks it was high.

(c) Plant grew during week.

(d) Plant grew during end of the week to the end of the week

(e) Plant grew the highest during second week.

(f) Plant grew the least during first week.

The growth of Plant B during:

1st Week

2nd Week

3rd Week

So, the Plant B grow the least in 1st week.

(g) At the end of the second week, plant were of the same height.