8th Class Mathematics Introduction to Graphs

  • question_answer 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 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.

    Answer:

                    (a) The Plant A after (i) 2 weeks was 7 cm high and after (ii) 3 weeks was 9 cm high. (b) The Plant B after (i) 2 weeks was 7 cm high and after (ii) 3 weeks was 10 cm high. (c) The Plant A grew \[9\text{ }cm7\text{ }cm=2\text{ }cm\] during the 3rd week.   (d) From the end of the 2nd week of the end of 3rd week, the Plant B grew \[10\text{ }cm7\text{ }cm=3\text{ }cm\]. (e) The Plant A grew in 1st week \[=2cm0cm=2cm\] The Plant A grew in 2nd week \[=7cm2cm=5cm\] The Plant A grew in 3rd week \[=9cm-7cm=2cm\] Therefore, the Plant A grew mostly in second week. (f) The Plant B grew in 1st week \[=1cm-0cm=1cm\] The Plant B grew in 2nd week \[=7cm-1cm=6cm\] The Plant B grew in 3rd week \[=10cm-7cm=3cm\] Therefore, the plant B grew least in first week. (g) At the end of 2nd week, the two plants shown here were of the same height.


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