Effect of acid rain on germination of cress seeds

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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.


  • Petri dish (11)
  • Cress seeds (20 11)
  • Sulphuric acid (70cm³)
  • Distilled water
  • Measuring Syringes (11)
  • Beakers
  • Filter paper (11)
  • Specimen tube (11)
  • Pipette




  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.

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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.
  • Don’t eat, drink or run in the lab.
  • Don’t throw objects because you could hurt someone.

Scientific knowledge: 

Acid rain the name suggests that acid rain ...

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