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Plot a graph of Red blood cells (Haemolysed) (%) against Salt concentration (g/100cm) (%) using the data provided. Label axes appropriately and draw a smooth curve of best fit.

Biology

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Step-by-step solution

4 steps

Here are the steps to plot the graph for question 6 (a)(i):

  1. Identify variables and set up axes.

    • The independent variable (x-axis) is the Salt concentration (g/100cm) (%).
    • The dependent variable (y-axis) is the Red blood cells (Haemolysed) (%).
    • Draw and label the x-axis as "Salt concentration (g/100cm) (%)" and the y-axis as "Red blood cells (Haemolysed) (%)".

  2. Choose appropriate scales for the axes.

    • For the y-axis (Haemolysed %): The data ranges from 0% to 100%. A suitable scale would be 1 cm (or 1 large square) representing 10%. This means 10 large squares will cover the full range.
    • For the x-axis (Salt concentration): The data ranges from 0.33 to 0.48. A suitable scale would be 1 cm (or 1 large square) representing 0.01 g/100cm. Start the x-axis at a value like 0.30 or 0.32 to utilize the graph paper effectively.

  3. Plot the data points.

    • Plot each pair of (Salt concentration, Haemolysed %) values from the table onto your graph:
      • $(0.33, 100)$
      • $(0.36, 91)$
      • $(0.38, 82)$
      • $(0.39, 69)$
      • $(0.42, 30)$
      • $(0.44, 15)$
      • $(0.48, 0)$

  4. Draw the curve.

    • Draw a smooth curve of best fit through the plotted points. Do not connect the points with straight lines; aim for a continuous, flowing curve that best represents the trend of the data.
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