Base your answers to questions 1 through 5 on the data table below and on your knowledge of biology. The data table shows the concentrations of oxygen in parts per million (ppm) present in freshwater and seawater at various temperatures.

 

 

1.  Mark an appropriate scale on each labeled axis. [1]

2.  Plot the data for freshwater oxygen concentration on the grid.

Surround each point with a small circle and connect the points. [1]

3.  Plot the data for seawater oxygen concentration on the grid.

Surround each point with a small triangle and connect the points. [1]

 

 

4.  Predict the oxygen concentration in freshwater at 35°C. [1]     __________ ppm

 

5.  State one relationship between temperature and dissolved oxygen concentration in water. [1]

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Base your answers to questions 6 and 7 on the information below and on your knowledge
of biology.

The graph below shows the effect of substrate concentration on the action of enzyme X. This enzyme is functioning at its optimal temperature, 36°C, and at its optimal pH, 5.5.

6. When the substrate concentration increases from 0.4% to 0.5%, the rate of the

reaction

(1) decreases

(2) increases

(3) remains the same

(4) increases, then decreases

7. State what would most likely happen to the rate of enzyme action if the temperature
were reduced by 10 degrees. Support your answer. [1]

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