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Germination lab experiment

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Introduction

Table of Contents Introduction 3 Research question 3 Hypothesis 4 Materials: 4 Variables: 4 Methods: 4 End result 5 Materials: 5 Variables: 5 Methods 5 Picture proof of experiment 6 Results - Table 7 Graph 7 Discussion: 7 Conclusion: 7 Evaluation: 8 Follow up experiment: 8 Bibliography 8 Introduction In this experiment we will be focusing on the factors, which influence the process of germination of a plant. Germination is the process when a seed sprouts from dormancy. The seeds are placed in soil or in any type of wet paper towel. It is basically the development of a seedling to a seed. The optimal germination pH is between 6 and 7.5. The cotyledons store food for the baby plant inside the seed. There are a few basic steps, which take place during germination 1. The seed absorbs water until it swells and smoothens its exterior wrinkles. 2. The seed then swells until the coat of the seed is ready to burst open. 3. The food, which was stored in the cotyledons or endosperm, soaks up water and the substances dissolved in it. 4. The enzymes then absorb the stored food and respiration begins. Energy and raw materials are gained through food for cell division and growth. 5. Then the radical appears, after which the pumule appears. 6. The seedlings then gain fresh weight through absorbing more water and thus lose dry weight. This continues until enough leaves get matured to produce through photosynthesis faster than it is used for growth. ...read more.

Middle

However there were a few things I changed but the concept and the focus on the factor of salinity remained the same. My aim and hypothesis is the same however a few of the materials have changed since some things were not available to me so I replaced them with other things. Materials: * Distilled water * Table salt * Measuring cup * Teaspoon * Small cup (for salt) * Plastic cup or bottles * 4 Petri dishes or bowls * 40 Mung beans * Tweezers Variables: Controlled variables: temperature, number of mung beans, amount of outside water or solution, sunlight, oxygen. Dependent variables: rate of germination Independent variables: The amount of salt concentration Methods 1. Preparing Salt solutions: * Measure salt required into a cup on scales * Then Add the salt to the amount of measured volume of water Salt concentration (c) (By weight) Grams of salt to add (s) 250ml Tap 0g 0.25% 0.6g 0.50% 1.3g 0.75% 1.9g Amount of salt to add (in grams) to demineralised water (in millimeters) for various salt solutions. 2. Preparing a Petri dish or bowl * Take cotton or a sheet of paper towel * Cut out a circle shape enough to fit in the bowl or Petri dish chosen * Do that 4 times and place the cut outs in each bowl or Petri dish 3. Labeling- Add a label on each bowl or Petri dish stating the amount of salt concentration which will be placed, which are 0.25 %, 0.5 %, 0.75% and tap 4. ...read more.

Conclusion

There were many things, which I did to ensure that this experiment could be accurate as possible such as- * Placing a lid on the on the bowl to prevent any loss of water through evaporation so that we could be sure that the seed was absorbing everything that was given to it. * Picking up the seeds with tweezers to prevent any internal or external damage to the seed. * Using a controlled experiment to be able to come up with better results. * Checking the plant on a regular basis to make sure experiment is working properly. * Spreading the seeds far apart so they have space to grow and won't end up being way too close to each other which would limit the space for growth not giving us reliable results. * Using a measuring beaker while measuring and not just assuming the measurements. There was however one thing that I could do next time to get even a better understanding of the experiment is use even more different amount of salt concentrations so then I would have had even a wider range of data to understand from. Follow up experiment: After this experiment we can continue it with another experiment where we can focus on another factor which influences germination such as the effect of amount of water on germination. In which we can try and place different amounts of water on the seeds and see the difference. ...read more.

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