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Biology: Lab report Germination

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Introduction

Biology Lab Report Seed Germination By: John Abarshi (Figure One: Cress Seed Germination) Introduction This term, we embarked upon our first biology experiment. Recently, in class, we have been learning about plant reproduction. Amongst the vast amount of information pertaining to the topic of plant reproduction is germination. Germination is the process of sprouting, whereby seeds or spores sprout or emerge and begin to grow. [1] [2] When a seed is germinating, certain factors affect its germination. It was our task to come up with two variables that could influence seed germination and to investigate this. After much contemplation and consideration, I managed to pinprick what factors I would like to investigate. I will thus investigate if altering the light and temperature of the cress seeds' environment will affect the germination. Research Question How do light and temperature affect the germination of a cress seed? Hypothesis If cress seeds are placed in a dark environment, then their germination will be negatively affected compared to cress seeds grown in a normal light environment because seeds If cress seeds are placed in an environment with excessive exposure to light, then their germination will be positively affected compared to cress seeds grown in a normal light environment because seeds If cress seeds are placed in a cold environment, then their germination will be negatively affected compared to cress seeds grown in a normal light environment because seeds If cress ...read more.

Middle

Little leaves have formed at the end of the shoots Little yellow leaves have formed at the end of the shoots Green leaves have formed at the end of ever-growing shoots Same as Day 2 Day 5 Some of the shoots are taller than others, there is quite a large difference They are not standing erect, and there is a large difference of sizes among the seeds Shoots are now standing erect with dark green leaves Yellow leaves have formed and the shoots stand erect Shoots are erect and are still growing Same as Day 2 Day 6 Same as Day 5 but longer All seeds have by now germinated, they are standing erect and tall Same as Day 5 but longer All seeds have germinated and are sporting long yellow leaved plants Plants have grown enormously and are no longer standing erect Same as Day 2 Day 7 Same as Day 6 but longer yet. All seeds have germinated. Same as Day 6 but a tad longer Same as Day 6 but longer Same as Day 6 but longer The plans have kept on growing but are still no longer erect Same as Day 2 Day 8 Same as Day 7 but longer, stems are white Same as Day 7 but longer and the stems are green White stems, same as Day 7 but longer White stems, same as Day 7 but longer The plants have ...read more.

Conclusion

The cress seeds that remained in the cold, stayed dormant and the heat alleviated that dormancy. [4] Evaluation I believe that my results are quite reliable. All controlled variables were kept controlled and so an unfair test would be unusual. If I were to carry out this experiment again, I would end up with the same results. That is how I know it is reliable. Another factor that ensures reliability is that multiple cress seeds were planted so it could not just have been a fluke. For these reasons, I believe that my results are reliable. I also believe that my results are quite valid. It is not as if the reason for some of my plants growing faster than others is reliant on something else. The results are well grounded in the logic of plant germination. It is justifiable with an adequate scientific explanation and thus I believe my results are valid to the fullest extent. Naturally, there are improvements that could be made to the experiment. If I were to execute this experiment again, I would monitor the seeds more often. Sometimes when I would come back to my seeds the next day, they would look enormously different to the day before. In the time in between these two steps, a lot could have happened. In this way, I feel that I have missed out on some crucial steps. Other than that, I am quite pleased with my results and the overall experiment. I have learned a lot throughout the entire process. ...read more.

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4 star(s)

A sound effort into the variables affecting seed germination. In an investigation it is normal to choose one independent variable and focus on this. However, both experiments were examined separately quite well.

The introduction would have benefited from giving some more detail into the science behind seed germination. For example how the seeds have evolved to not germinate when it is cold as this is the winter months when there is less sunlight to photosynthesise from.

The graphs showed the trends in the data very well and linked in well with the analysis and conclusion.

Marked by teacher Jon Borrell 22/05/2013

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