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Introduction to Graphs
(a) How high was plant A after (i) 2 weeks and (ii) 3 weeks?
(b) How high was plant B after (i) 2 weeks and (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.
(a) (i) After 2 weeks: The plant A was 7 cm high. (ii) After 3 weeks:The plant A was 9 cm high.
(b) (i) After 2 weeks: The plant B was 7 cm high. (ii) After 3 weeks: The plant B was 10 cm high.
(c) During the 3rd week, the plant grew (9 cm – 7 cm), i.e. 2 cm.
(d) The plant B grew 10 cm – 7 cm = 3 cm from the end of 2nd week to the end of the 3rd week.
(e) The growth of the plant A:
During the 1st week = 1 cm – 0 cm = 1 cm, During the 2nd week = 7 cm – 1 cm = 6 cm, During the 3rd week = 9 cm – 7 cm = 2 cm. Thus, during the 2nd week, the plant A grew the must.
(f) The growth of the plant B during:
the 1st week = 1 cm – 0 cm = 1 cm
the 2nd week = 7 cm – 1 cm = 6 cm
the 3rd week = 10 cm – 7 cm = 3 cm
Thus, the plant-B grew the least in the first week.
(g) Both the plants have shown almost the same height at the end of the 2nd week.
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Ratana fell sick. Her doctor maintained a record of her hody temperature, taken every four hours. It is shown in the following time-temperature graph.
(a) During which period the temperature showed a rising trend?
(b) During which period the temperature showed a downward trend?
(c) At what time the temperature was highest?
(d) At what time the temperature was lowest?
Plot the following points on a graph sheet. Verify if they lie on a line:
(a) A (4, 0), B(4, 2), C(4, 6), D(4, 2.5)
(b) P(1, 1), Q(2, 2), R(3, 3), S(4, 4)
(c) K(2, 3), L(5, 3), M(5, 5), N(2, 5)
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