Effect of light strength on photosynthesis

Plants which obtain energy from sun rays and carbon dioxide to make carbohydrates are the process called photosynthesis. Then plants will take skin tightening and from the atmosphere, add some water and use the vitality of sunlight to form sugar. The overall equation can be summarized as below

6CO2 + 6H2O C6H12O6 + 6O2

In biology, certain requirements for photosynthesis are chlorophyll, skin tightening and, light and normal water. In fact, almost all of photosynthesis occurs in the chloroplast, Chlorophyll absorbs natural light then changed into chemical energy during the procedure for photosynthesis. (Campbell 2008)

There are two periods for photosynthesis. They may be light response and dark response. Firstly, light energy splits normal water into oxygen and hydrogen through the light response. Then NADP and hydrogen add together and form NADPH2. From then on, oxygen atoms sign up for one another and form O2, at the moment it released in the atmosphere. (Bailey 1997) In addition, light energy generates ATP from ADP. The light reaction can even be summarized as below

2H2O + NADP + ADP + P sun rays O2 + NADPH2+ ATP Chlorophyll

Hydrogen is moved into dark response. Then oxygen is released. It only occurs in the presence of light. Therefore, NADPH2, O2 and ATP will be the products of light reaction.

Secondly, carbon fixation occurs in the dark reaction has shown as below

ATP + NADPH2 + CO2 ---------> ADP + P + NADP + glucose

Enzyme use NADPH2 and ATP as the to convert to carbon dioxide. And carbon dioxide is ingested from the atmosphere in dark effect. (Bailey 1997) And CO2 is converted into carbohydrates such as sugar.

The attentiveness of water, skin tightening and, the temp and the light depth are the most common environmental factors to have an impact on photosynthesis (Lincoln 2010). Therefore the aim of this scientific experiment is to research the consequences of light level on the pace of photosynthesis.


Kept all the beakers and test pipes to be utilized on snow. Stalks are taken off leaves and leaves are surface in 200mL solution of buffer A. Buffer A was a mixture of potassium dihydrogen orthophosphate 10mM, disodium hydrogen orthophosphate 10mM and magnesium chloride 5mM. Then your extract is poured through the two levels of muslin into a beaker and suspension is also poured through eight tiers of muslin into other beaker. The centrifuge spun the suspension system at full acceleration in one minute. Then suspension is poured off and renewable chhloroplast is produced in total of 15mL solution of buffer C and it stored in glaciers for use. Buffer C was a remedy same to buffer A but without magnesium chloride.

Used the various pipettes to perpare the perfect solution is of buffer B at 6. 7mL and 0. 2mL chloroplast solution into a test tube. Mixed each solution well. No the spectrophotometer using 1. 0mL of concoction at absorbance wavelength of 590nm. The spectrophotometer is employed to assess how much light that the blend absorbed.

Used the various pipettes to get ready the perfect solution is of buffer B at 6. 7mL, 0. 2mL of chloroplast solution and 0. 1mL of the dye into another test tube. Mixed each solution well and put it into the cuvette. The cuvette was located at 0. 3m for 60s from the light fixture and the optical density of 1 1. 0mL of the solution was measured with the spectrophotometer. All readings noted in the stand and the optical denseness of solution was assessed again. Repeated the same process at 0. 5m, 0. 7m, 0. 9m, 1. 0m from the light and each distance got a new concoction.

The chloropast solution should retained in glaciers in this experiment to be sure that the solutions did not have any reaction until they located under the light. Documented the optical density at 590nm in each different distance from the lamp fixture.


Rate of dye reduction

Distance from light strength (m)

The graph shows that the length from light intensity are increased when the speed of dye decrease cut down between 0. 3m to at least one 1. 1m. Which means that the speed of photosynthesis also lessens in this graph. The maximum rate of dye reduction is 0. 398 at 0. 3m from the light and the lowest rate of dye reduction is 0. 045 ate 1. 1m from the light. Based on the data of these graph, Q1=0. 065, Q3= 0. 345 and IQR =0. 28. The lowest rate of dye reduction is 0. 065-1. 5 x 0. 28 = -0. 355. In this case the cheapest rate of dye decrease from the info lays above -0. 355, so there is absolutely no outlier. Alternatively, the upper rate dye decrease is 0. 345+1. 5 x 0. 28 = 0. 765. Hence there is absolutely no outlier also. The info are positively skewed distribution because the data style from the left to the right.


During the photosynthesis, the light intensity will increase when the rate of photosynthesis increase. (Pang 2006) In my own result, the ranges from light strength are increased when the pace of photosynthesis decreases, which mean when the light intensity decrease, the pace of photosynthesis also diminishes. In cases like this, my result is true.

There are some experimental mistakes in this experiment. It is hard for all of us to make certain the chloroplast solution will not active until they were placed under the lamp fixture because there have been the other light from the encompassing in the room such as neighbour lights. So the test should be achieved in a dark room that can decrease the effect of the light and the effect can be more exact. Also, more cuvette should be provided because it will effect the result if a few of cuvette had not been clean well.

Moreover, there are some limits in this experiment. Different solution should be used different pipette to prevent the other solution will add on the result. Also, meaured the quantity of each solution that will help to reduce variations. Furthermore, put the test tube of chloroplasts in the snow because this may ensures the heat of the test tube is not affected by the heat realeased from the lamp. As heat might influence the enzyme activity of the flower and hence the rate of photosynthesis.

Light is needed for photosynthesis in crops. When chloroplasts in the leaf's cell are facing to light, they form ATP from ADP. Oxygen is produced through the photosynthesis. (Campbell 2008) Corresponding to my final result, light energy rises when more drinking water molecules are split into oxygen. At the moment, the light reaction occurs faster and even more ATP and NADPH2 are produced. Therefore, it has more glucose and oxygen developed in dark effect. In this case thre rate of photosynthesis rises.

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