Photosynthesis By: August Sarracco

Photosynthesis is the process in which plants convert sunlight into energy. They use sunlight to produce glucose from carbon dioxide and water. This glucose can be converted into pyruvate which releases adenosine triphosphate (ATP) by cellular respiration.

The process of photosynthesis is divided into two main parts: light dependent reactions and light independent or dark reactions.

The absorption of light is the first step in photosynthesis. The chlorophyll in the chloroplasts inside the leaf cell absorbs sunlight.

Light-dependent reaction

Excited electrons leave photosystem ll, while splitting a water moelcule, they're transferred to electron acceptors leaving the reaction center.

Then the electrons are moved to photosystem l. After that they are transferred to a protein called ferrodoxin. Ferrodxin transfers them to the electron carrier NADP+. Forming the energy-storing molecule NADPH.

The Calvin Cycle

Six CO2 molecules combine with six 5-carbon compounds to form twelve 3-carbon molecules called 3-PGA.

Chemical energy stored in ATP and NADPH is transferred to the 3-PGA molecules

Rubisco converts the remaining ten G3P molecules into 5-carbon molecules called RuBP. These molecules combine with new carbon dioxide molecules to continue the cycle.


Created with images by PublicDomainPictures - "abstract backdrop background" • momentcaptured1 - "plant" • Nico Nelson - "274-365 011011 Spination" • MiguelVieira - "Venus fly trap on Carolina Beach State Park Flytrap Trail" • hortulus - "Sedum pachyphytum"

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