Photosynthesis Investigation

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Photosynthesis Investigation

Aim: To find out how the rate of photosynthesis is affected by changing the amount of light.

Apparatus:

Prediction:

In this experiment I am planning to change the amount of light I am panning to measure number of bubbles given off in a certain period of time.

I think changing the amount of light will affect the rate of photosynthesis, because plant photosynthesis faster on sunny day than on a dull day. So if you move the light away from plant it want photosynthesis. And also a plant may have lots of water and Carbon dioxide, but it will not photosynthesis very fast if there is not enough light, increasing the light intensity will make photosynthesis faster.

As less light gets to the plant the speed of photosynthesis will be less. The following equation summarizes what happens during photosynthesising.

Carbon + water    Sunlight      Glucose + Oxygen.

Dioxide              Chlorophyll

Chlorophyll absorbs light energy and transfers it into chemical energy. This energy is used in a chemical reaction dioxide and water into glucose and oxygen. The glucose is either stored as starch, or used for respiration. The oxygen, released as a by-product of photosynthesis, is very important because it provides the main source of oxygen for animal respiration.  

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Method:  I am going set the apparatus as it is in the diagram. I am going to change the distance of the light from the plant by moving the lamp for a certain distance from the plant. The range of 5 different distances is follows:

15 cm,

20 cm,

35 cm,

40 cm and

55 cm.

Then I am going to measure this by counting the number of oxygen bubbles given off over 1 minute from end of water. This is used as a measure of the rate of photosynthesis. Repeat the experiment two on three times ...

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