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Investigate the effect of the light intensity on photosynthesis with different concentration of Carbon Dioxide.

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Introduction

To investigate the effect of the light intensity on photosynthesis with different concentration of Carbon Dioxide. Investigating the effect of light intensity on photosynthesis having two samples of a certain plant with 2 different carbon dioxide concentrations. H :There is no significant difference between the rate of photosynthesis of plants in different concentration of CO at different light intensities. H :There is a significant difference between the rate of photosynthesis of plants in different concentration of CO at different light intensities. The oxygen bubble coming off as a result of photosynthesis of plant in certain period of time (5 minutes) is collected and the volume of oxygen bubble is worked out. This volume is used for working out the rate of photosynthesis of the plant in a certain light intensity and CO concentration. Then the rate of photosynthesis of each sample of the plant, which has a different CO concentration, is recorded in 6 light intensities and the results are compared with each other. The results confirmed that as the light intensity decreases, the rate of photosynthesis decreases more for the plant with lower concentration of CO than the plant with higher concentration of CO . ...read more.

Middle

It is a process in which energy is transduced from one from to another and results in the inorganic molecules, carbon dioxide and water, being built up into organic molecule. Oxygen is produced as a waste product. In green plants, the first stable organic molecules to be formed in photosynthesis are simple sugars, which can be used as source of energy or used in the synthesis of other organic molecules. The general equation for photosynthesis can be written as: light CO + 2H O (CH O) + O +H O chlorophyll Carbon +water carbohydrate + oxygen + water Dioxide Photosynthesis occurs in two stages: * The light -dependent stage, which require light energy and results in the production of ATP (adenosine triphosphate ) and NADPH (reduced nicotinamide adenine dinucleotide phosphate ) * The light -independent stage in which the NADPH is used to reduce carbon dioxide to carbohydrate, ATP is required in this stage. From the direct products of photosynthesis, green plants can synthesise proteins, polysaccharides, lipids and nucleic acids, all of which contribute to the structure and functioning of cells and organelles. ...read more.

Conclusion

1.2 20 1000 400 1.0 1.3 1.1 1.13 25 1000 625 1.0 0.9 1.1 1 30 1000 900 1.0 0.8 1.1 0.97 Results: The table to show the length of oxygen bubble in the plant with 0.5% carbon dioxide concentration. Analysis: It can be seen from the tables and graphs that when the light intensity decreases, the length of oxygen bubble decreases and so the volume of oxygen bubble and therefore the rate of photosynthesis decreases as less oxygen has evolved and this is because light becomes a limiting factor. In the first plant which has higher carbon dioxide concentration when the light intensity decreases between 5 to 30 cm away from the beaker the length of the oxygen bubble decreases from 3.87 to 2.17 mm and also the oxygen bubble volume decreases a lot with a steep gradient when the light intensity decreases from 40 to 10 (1000/d ). And the graph of rate of photosynthesis shows that the rate of rate of photosynthesis has decreased too as the light intensity decreases. After that even though the rate is still decreasing but the gradient is not as steep as before and the curve slowly levels off. ...read more.

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