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A group of students carried out a study of the population growth of flour weevils. They put16grams and 64 grams of maize flour into two equal boxes K and L respectively. They then introduced equal numbers of weevils into the boxes. The boxes were kept under similar environmental conditions. The weevils were counted at intervals and the results recorded in the table below.
 

No. of days after introduction of weevils   Approximate No. of weevils present​ 
 K L

40

60 

80 

100 

120 

135 

150 

20

20 

200 

550 

560 

650 

640 

650 

645 

20

20

300

800

1300

1750

1750

1740

1748

  1. Using a suitable scale, draw two graphs on the same axes from the results in the table. Plot approximate number of weevils present on the Y – axis. 
  2. What were the approximate numbers of weevils present in the two boxes on the 70th day.
    Number in K
    Number in L
  3.    
    • On the what day was the population of weevils in K 580. 
    • Between which days was the population difference greatest. 
  4. Account for the shape of graph L between day 5 and day 100. 
  5. State factors that would make the human species assume the graph curve between day 100 and day 150.

1 Answer

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  1. BioF4T1P2a6
  2. Number in K - 555
    Number in L - 1020
  3.   
    • 86th day
    • 100-120
  4. Increase in population ; because there is adequate food ; the number of reproducing individuals is increasing ; wastes products have not accumulated to toxic levels;
  5.    
    • Diseases
    • Lack of food
    • Death rate equal to birth rate

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