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Биология
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реферат
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16 стр.
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16.08.2008
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.doc — Microsoft Word
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Extended EssayBiology (SL)
“The effect of light intensity on the amount of chlorophyll in “Cicer arietinum”Word count: 4 413 wordsContentAbstract ……………………………………………………………………………… 2Introduction ………………………………………………………………………….. 3Hypothesis …………………………………………………………………………… 3Method:
Description ..………………………………………………………………………….. 8Results ……………………………………………………………………………….. 10Discussion ……………………………………………………………………..…….. 14Conclusion ………………………………………………………………………..….. 14Evaluation of the method ………………………………………………………..…… 15Bibliography …………………………………………………………………………. 16Abstract.
Plants, growing on the shaded area has less concentrated green color and are much longer and thinner than plants growing on the sun areas as they are dark green, short and thick. Research question was: “How does the amount of chlorophyll-a and chlorophyll-b, gram per gram of plant, depends on the light intensity in which plants are placed?”
Hypothesis suggests that there are several inner and outer factors that affect the amount of chlorophylls a and b in plants and that with the increase of light intensity the amount of chlorophyll will also increase until light intensity exceeds the value when the amount of destructed chlorophylls is greater than formatted thus decreasing the total amount of chlorophylls in a plant.
The seeds of Cicer arietinum were divided into seven groups and placed into various places with different values of light intensities. Light intensities were measured with digital colorimeter. After three weeks length was measured. Then plants were cut and quickly dried. Their biomass was also measured. Three plants from each group were grinded and the ethanol extract of pigments was prepared. The amount of chlorophylls was measured using method of titration and different formulas.



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