Seed germination experiment. Aim: To investigate the following factors affecting seed germination (warmth, water, light, air)
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Victor Vildé 10 may 2010 Seed germination I) Aim: To investigate the following factors affecting seed germination (warmth, water, light, air) II) Hypothesis: The seeds with all the factors will be the best developed. I think the grains without water, air and warmth will not grow because seeds need water and warmth to be activated and they need oxygen to develop. The seeds without light will grow but it will not have a green colour because the plants need light to make photosynthesis. 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))
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" Independent Variable Germination Colour Image Height (cm) Amount of seed germinated (/10) Other observations Control Yes Green 2.5 6 No warmth No The seeds are cold No water No The seeds are dry
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: Weakness and errors in the procedure Suggestion to improve The case of the control, the light is an artificial light. To redo the experiment with the boiling tube near a windows without artificial light. In the case with no light, the cupboard was not totally dark. To redo the experiment with the boiling tube in a totally dark environment In the case with no warmth, the fridge was cut during 48 h To redo the experiment without cutting the fridge. We tried with one kind of seed. We have to try with other kind of seed.
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