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David King

on 29 September 2016

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Transcript of Photosynthesis

The two stages
Photosynthesis requires two stages:
1) Light-dependent stage and
2) Light-independent stage.
Light Dependent Stage

This stage uses energy from the sun to make chemical energy. this energy is then transferred into ATP and NADPH.
This stage uses 6 carbon dioxide molecules, the NADPH and ATP from the light dependent stage to create 12 3-carbon molecules. The 3 carbon molecules are use to make glucose and sugar to fuel the cell.
The Calvin cycle (cellular respiration cycle for plants) gathers carbon from the atmosphere. The carbon is then combined in the stoma with other carbon molecules. These form 3 carbon molecules the continue the Calvin Cycle.
For every carbon dioxide 12 3-carbon molecules will be made. these 3-carbon molecules will go through the Calvin Cycle having some of the carbon bonds broken by the ATP and NADPH(from the light dependent cycle) of the 12 3-carbon molecules two are used to make organic compound and the rest continue in the cycle.
The two 3-carbon molecules bond together to make glucose.This glucose is stored for later use by the plant or is consumed by a animal for its later use.
Photosynthesis uses carbon dioxide and water to produce glucose and oxygen where as cellular respiration used glucose and oxygen to produce ATP and carbon dioxide.

Together they use light energy and transfer it into chemical energy and the chemical energy is used for cellular movement and processes.
For each glucose molecule that is broken down during glycolysis 3 pyruvate molecules are made. During the Krebs cycle the pyruvate molecules are broken down in to acetyl-CoA and releases 4 carbon dioxide. See image. The resulting carbon dioxide is expelled and the ATP made is used for cellular processes and movement.
Light independent stage
The Calvin Cycle
Krebs Cycle
Here you can see the carbons that are expelled during the Krebs cycle.
Calvin Cycle Continued
Calvin Cycle continued
Full transcript