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Light And Photosynthesis Essay

1412 words - 6 pages

Introduction.
Light is a very important factor in the rate of photosynthesis, in my project I am going to test that plants do need light in order to photosynthesise. It will be very interesting to see how light will influence the rate of photosynthesis in plants and what will happen if they do not get the required light in order to produce starch .
The plant I have chosen to do is a Geranium which is a dicotyledonous plant found in the dry and hot regions of South Africa.

Aim
To see whether light effects the rate of Photosynthesis in plants or not.

Research Hypothesis.
Photosynthesis will occur at a faster rate when the plant is exposed to the sun, than when it is not exposed to sunlight.
I chose to test the effect light has on plants because it is very interesting to test that light is a very important factor, and as the earth gets hotter it will be interesting to see what will happen at the end while sunlight is important at the moment and is a core ingredient for photosynthesis, it will also be very interesting to see what would happen if the plants had no exposure to sun at all, and if they would adapt.

Literature Review
Article 1:
Plant Photosynthesis.
Photosynthesis is a process in plants that converts light energy into chemical energy, which is stored in bonds of sugar. The process occurs in the chloroplasts, using chlorophyll. Photosynthesis takes place in green leaves. Glucose is made from the raw materials, carbon dioxide, water, light energy and oxygen is given off as a waste product. In these light-dependent reactions, energy is used to split electrons from suitable substances such as water, producing oxygen. In plants, sugars are produced by a later sequence of light-independent reactions called the Calvin cycle. In the Calvin cycle, atmospheric carbon dioxide is absorbed into already existing organic carbon compounds. Using the ATP and NADPH produced by the light-dependent reactions, the resulting compounds are then reduced and removed to form glucose.
http://biology.clc.uc.edu/courses/bio104/photosyn.htm
Article 2:
Effects of light.
Light initiates the opening of the stomata, which results in carbon dioxide being absorbed for photosynthesis during the light-dependant phase, during this the rate of photosynthesis will increase. Brighter light means an increase in photosynthesis
At low light intensities, as light intensity increases, the rate of the light-dependent reaction, and therefore photosynthesis generally, increases.
http://www.rsc.org/learn-chemistry/content/filerepository/CMP/00/001/068/Rate%20of%20photosynthesis%20limiting%20factors.pdf
Article 3:
Geraniums.
Geraniums are dicotyledonous plants that are found in the hot and dry regions of South Africa. They belong to the Geraniaceae family and the Plantae kingdom. The long leaves are round in shape. The flowers have five petals and are coloured white, pink, purple or blue. Geraniums will grow in any soil as long as it is not waterlogged. Reproduction...

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