O Level Biology Weekly Quiz

1.

Concentration of Carbon Dioxide

The graph shows the concentration of carbon dioxide in the air surrounding a plant measured over
24 hours. Which explains the carbon dioxide concentration at time X?

2. Milk produces a red precipitate when heated with Benedict’s solution.
A purple colour develops when the biuret test is used on milk.
Using these results only, which nutrients does milk contain?

3.

Salt movement in a cell

The arrows show the movement of salts into a cell. Which describes the movement of the salts?

4.

Cylinders of potato tissue were placed in different concentrations of a sugar solution. The graph shows the percentage change in length of the cylinders of potato tissue.

Which solution has the same water potential as the potato tissue?

5. As a seed begins to germinate, it uses enzymes to speed up the rate of

6.

Diagram showing a cell

This diagram shows a cell. Which parts are the cell membrane cell wall cytoplasm respectively

7. What are some of the end products and effects of anaerobic respiration in muscle?

8.

Diagram showing a cell

This diagram shows a cell. Which parts are the cell membrane cell wall cytoplasm respectively

9.

Plants left in sunlight

The diagrams show a plant in a flask of water. It is left for six hours on a warm and windy day in bright sunshine. Which process explains the result shown in diagram 2?

10.

Cross section of a leaf

Where in the leaf does gaseous exchange occur?

11. Where in the alimentary canal is most water absorbed?