How Do Light Dependent Reactions Differ From The Calvin Cycle?


4 Answers

ray of light Profile
ray of light answered
Photosynthesis consists of these two reactions:
1: Dark reaction or calvin cycle
2: Light dependent reaction
The main difference between these reactions is their dependency on light. Calvin cycle occurs without needing light,where as the light depending reaction, as the name suggests, cannot occur when the light is not available.
Calvin cycle use carbon dioxide to make sugar and provide energy and the hydrogen ions to the plants, where as the light dependent reaction or photosynthesis use light to make ATP and NADPH2 for the sugar making process of the calvin cycle.
John McCann Profile
John McCann answered

The light dependent reaction is the photo of photosynthesis. It takes the photons of light, splits water to replace the electrons lost to the reaction center from P680 and in photosystem II produces ATP to send to the Calvin cycle where carbon, from CO2 is fixed. Photosystem II sends the electrons that have traveled down it's electron transport chain on to photosystem I where they are used to produce NADPH which is also sent to the Calvin cycle. Both the products are used in the Calvin cycle " shuffling " to produce the one molecule of glyceraldehyde-3-phosphate used by the plant to make sugar.

Anonymous Profile
Anonymous answered
The main difference between them is when the Calvin cycle does not need light and light dependent reaction need light
Anonymous Profile
Anonymous answered
I would say ATP, reduced NADP and CO2. Ribulose biphosphate could also be one but that is being continually produced by the Calvin cycle. CO2 is gained from the air. ATP and reduced NADP are made in the light dependant stage of photosynthesis.

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