2. Methods

2.1 Equipment

Equipment ordered from school

Apparatus	Quantity	Apparatus	Quantity
Bell jar	3	Spirit flame	1
Measuring Beaker	1

Equipment self-ordered

Materials	Quantity	Materials	Quantity
Green bean seeds (Packet)	1	Cotton wool (Packet)	1
Soil (Packet)	1	Plastic cups	3
Matchsticks (Boxes)	11	Aluminium trays	3
Mini aluminium trays	2	Charcoal	1kg
Fire starter	40	Spark Gun	1

2.2 Diagram

Figure 1 : Setup with high amount of pollutants

Figure 2 : Setup with low amount of pollutants

Figure 3 : Setup with no pollutants

2.3 Procedures

1. Fill each pot with the same amount of soil (150mℓ) and water, (4mℓ).

2. Place 4 seeds exactly 3 (cm) apart. This is so that the plants will not get over-crowded to  ensure reliability of the results. Name each cup set-up 1, set-up 2, set-up 3.

3. Place the set-ups in the respective bell jars.

4. Measure the amount of combustible material (g) to be put in each set-up. Then add the materials into the bell-jar and start the burning.

5. Place the burnt material (69g) above an aluminium disposable tray for set-up 1. For set-up 2, place burnt material (28g) in the bell jar on the aluminium tray.

6. Let the fire burn for a few minutes, because there will be little oxygen inside the bell jar. Once it has burnt enough, place the plant with the aluminium tray together and quickly cover it with the bell jar. Do the same for set up 2.

7. Begin the measurement of the plants growth in (cm) per day. Plants must be watered with the same amount of water each day, per (mℓ). Plants must also be in the same location to ensure that the amount of sunlight received by each bell jar is the same to reduce an effect on the results.

8. After collating all the data and looking at the results and doing an analysis, we can find out whether polluted air really affects the growth rate of the plants and by how much.

9. Repeat the experiment again to make sure that the growth of the plants are not due to human error, and that the quality of air actually affects the growth of plants.