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Carry out an investigation comparing the rates of the utilisation of food reserves during the germination of seeds of two different species.

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Introduction

Louise Ovonlen 1336 Biology planning exercise Introduction As seeds germinate they use stored food reserves for growth and respiration. Due to this the dry mass of the seedlings progressively decreases in the early stages of their development. I must carry out an investigation comparing the rates of the utilisation of food reserves during the germination of seeds of two different species. Health and safety The main health and safety factor that needs to be addressed is the oven. As it can become extremely hot. To prevent one from getting burnt, gloves must be used always when extracting things from the oven. Wear plastic gloves preventing spread of plant diseases caused by fungus and bacteria on your hands. Constant and Variable During the experiments there are several constants and variables to consider. I will keep the amount of seeds constant, the water given to the seeds constant, the temperature constant to preventing the enzyme inside the seed from being denatured and the light source constant as we don't want the seed to carry out photosynthesis (which will total darkness) ...read more.

Middle

Factors that can trigger germination and growth are: * Water: the seeds require water so that it can use the food reserves, which are stored inside it. * Light: Can trigger germination, which follows after water uptake. Preliminary work Preliminary work was carried out to find out which seed might be used: Horticulture science Plant Time it takes for seeds to germinate (days) Temperature in degrees Celsius Light/Dark requirements Ageratum 5 to 10 days 21.1 Light Alyssum 5 to 10 days 21.1 Either Aster 5 to 10 days 21.1 Either Begonia 10 to 15 days 21.1 Light Browallia 15 to 20 days 21.1 Light Centurea 5 to 10 days 18.3 Dark Cucumber 5 to 10 days 29.4 Either Eggplant 5 to 10 days 21.1 Either Larkspur 5 to 10 days 12.7 Dark Muskmelon 5 to 10 days 29.4 Either Pansy 5 to 10 days 18.3 Dark Pepper 5 to 10 days 26.6 Either Phlox 5 to 10 days 18.3 Dark Snapdragon 5 to 10 days 18.3 Light www.ces.ncsu.edu.htm I have chosen to use Pansy seeds and Phlox ...read more.

Conclusion

Label each batch 1-11 and add to the label whether they are Pansy or Phlox 5. Set up 26 growing environments for the seeds by placing moist cotton wool onto dishes 6. Place the dishes in a cupboard away from light Stage 2: 1. On day one place 2 dishes labelled number 1 (1 lot of Pansy and 1 lot of Phlox seeds) into an oven. 2. Heat until completely dried out 3. Remove from oven and weigh 4. Record your observation. 5. Continue this for day 2 up until day 11 Louise Ovonlen 1336 Results table. Day Mass of Pansy seed mg Mass of Phlox seed mg 1 2 3 4 5 6 7 8 9 10 11 How would I make my experiment more accurate? To make my experiment more accurate I would: * Use 3 different types of seeds making my results more precise deleting any anomalous results * Carry out similar tests with seeds that grow only in light. This way I would be able to see if I would obtain similar results to the seeds observed in the dark. ...read more.

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