The Effect of Acid Rain on Germination of Cress Seeds

The Effect of Acid Rain on Germination of Cress Seeds

Aim: to investigate that how the acid rain affects the germination of

cress seeds.

The factors that effect the germination of seeds are:

· Temperature

· Acid rain

· Oxygen

· Water

I will just see what effect does the acid rain have on germination of

seeds.

Apparatus:

· Petri dish (11)

· Cress seeds (20 11)

· Sulphuric acid (70cm³)

· Distilled water

· Measuring Syringes (11)

· Beakers

· Filter paper (11)

· Specimen tube (11)

· Pipette

Diagram:

Method:

1. I collected all the apparatus needed (see apparatus list).

2. I made a dilution series (see dilution series).

3. Placed the filter paper in the bottom of the petri dish.

4. Took 10cm³ of diluted acid from dilution of 0.010 and labelled it

0.010. I repeated this with every single dilution and petri dish. But

wash the syringe with water so there is no acid in the specimen tube.

5. Picked 20 cress seeds for each petri dish and placed in each petri

dish.

6. Took 3cm³ distilled water in the pipette and putted it onto the

seeds.

7. Check the seeds everyday for three days that if they have

germinated or not. Also add 3cm³ of distilled water to each petri

dish.

Prediction: I predict that the stronger the concentration of the acid

the fever seeds will germinate. The stronger the concentration of acid

the smaller the length of germination.

Fair test: to make the experiment a fair one I will control the amount

of water, temperature and concentration of the acid. I will use 20

cress seeds to get reliable set of results for each dilution.

Safety: to make the experiment I will follow these rules:

· Always wear safety glasses because of the acid.

· Wear the lab coat all the time in case the acid spills on you.