O Level Biology Practice Test

1.Which structures are found in animal cells and in plant cells? 1 mitochondria, 2 cell wall, 3 ribosomes, 4 sap vacuole
1 and 3
1 and 4
2 and 3
2 and 4

2.A student draws a red blood cell. The drawing is 20mm in diameter.This red blood cell is actually 0.008mm in diameter. What is the magnification of the cell shown in the drawing?

×40
×250
×2500
×40000

3.The diagram shows some of the features used to classify animals in the phylum arthropods.In the diagram, which letter, A, B, C or D, could represent insects?

A
B
C
D

4.Which processes can only occur through a membrane?

A
B
C
D

5.A student cuts four cylinders from a potato.Each cylinder is 30mm long. The cylinders are all of the same diameter.The potato cylinders are placed in sugar solutions of different concentrations. After one hour, the lengths of the cylinders are measured again. The results are shown in the table.Which sugar solution has a water potential closest to that of the potato cells?

A
B
C
D

6.An area of grass plants becomes flooded with sea water. Sea water contains a higher concentration of salt than the root hair cells of the grass plants. What is the effect of the sea water on the functions of the root hairs?

A
B
C
D

7. Large biological molecules are made from smaller molecules. Which row shows the correct molecules?

A
B
C
D

8.Enzyme action can be explained by the lock and key hypothesis. Which row is correct for the active site and for the substrate?

A
B
C
D

9.The diagrams show an experiment to find the rate of photosynthesis in an aquatic plant in different conditions. Which plant produces the most bubbles per minute?

A
B
C
D

10. A student grows young plants in four different test-tubes.Tube W contains all the mineral ions needed for healthy plant growth. The diagram shows the appearance of the plants after two weeks.

Choose the correct answer from the options below What do tubes X, Y and Z contain?

A
B
C
D

Score =
Correct answers: