Seed germination experiment. Aim: To investigate the following factors affecting seed germination (warmth, water, light, air)

III) Variable:

Constant: cotton wall, surface area of the boiling tube, water, light, air.

Independent variable: warmth

Dependent variable: seeds germination    

IV) Laboratory apparatus:

• 5 Boiling tubes to put the seeds in a special environment with different factors (no warmth (1), no water (2), no light (3), no air(4), Control (5))
• Boiling tube rack: to hold the boiling tube while we are preparing the experiment

V) Method:

We put five boiling tube in a boiling tube rack. In the five boiling tube we put a cotton wall at the bottom with 10 seeds on it. Then we take one of the boiling that we put aside. This boiling tube will be the case with no water. We take the four left and we put the same amount of water in them.  Then we take three of them to be the cases with no light, no warmth and the control. With the last one we put oil in it to be the case with no air. Then we take the boiling tube that has to be the case with no light and put it in a dark cupboard. We take the boiling that has to be the case with no warmth and we put it in a fridge.  

VI) Results table:         “The factors affecting seeds germination”  

VII) Conclusion:

To germinate a seed needs at least these three factors: water, warmth and air. It needs water and warmth to be activated and air to have oxygen which is essential for aerobic respiration. The aerobic respiration is needed for the development of the plants because it is the main source of energy until the leaves grow. A seed needs light because the leaves make energy from light by photosynthesis. The photosynthesis makes the green colour of the plant and converts carbon dioxide to sugar or other organic compounds to make energy.  So a seed needs warmth, water, air and light to develop correctly.    

VIII) Evaluation: