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17. The data below shows the approximate number of ticks per animal in a certain farm before and after spraying the animals with a

17. The data below shows the approximate number of ticks per animal in a certain farm before and after spraying the animals with a constant concentration of a specific acaricide. The spraying was done once per month. Time in years 0 Number of ticks 200 120 3610 15 18 20 40 20 19 25 45 90 3 a) i) Plot a graph of number of ticks against time. ii) What is the significance of time O? b) Explain the changes in the number of ticks per animal between i) Time zero and 10 years ii) 15 to 20 years. c) i) Explain the disadvantages of using acarides in tick control ii) State three alternative methods farmers would be advised to use instead of chemicals in control of ticks. d) Give a brief classification of ticks as shown below Phylum_ Class 6mks 1mk 3mks 3mks 2mks 3mks 2mks

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