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Ex 15.1, 3 - For an experiment in Botany, two different plants, plant

Ex 15.1, 3 - Chapter 15 Class 8 Introduction to Graphs - Part 2
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Ex 15.1, 3 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 of 3 weeks. The results are shown by the following graph. (a) How high was a plant A after (i) 2 weeks? (ii) 3 weeks? (i) Height of plant A after 2 weeks = 7 cm (ii) Height of plant A after 3 weeks = 9 cm (b) How high was a plant B after (i) 2 weeks? (ii) 3 weeks? (i) Height of plant B after 2 weeks = 7 cm (ii) Height of plant B after 3 weeks = 10 cm (c) How much did the plant A grow during the 3rd week? Height of plant A gained during 3rd week = Height after 3rd week − Height after 2nd week = (9 − 7) cm = 2 cm (d) How much did Plant B grow from the end of the 2nd week to the end of the 3rd week?Required height = Height of plant B after 3rd weak − Height of plant B after 2nd week = 10 cm − 7 cm = 3 cm ∴ Plant B has grown 3 cm (e) During which week did Plant A grow most?Plant A grows most between Week 1 and Week 2 i.e. during the 2nd week. (f) During which week did Plant B grow least? Plant B grows least between Start and Week 1 i.e. during 1st week. (g) Were the two plants of the same height during any week shown here? Specify.Yes, at the end of 2nd week both plants were of 7 cm

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.