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Kamis, 18 November 2010

Explanation text

Photosynthesis Process



Photosynthesis is a Biochemical Process that occurs in plants, algae, and some bacteria, Creating the Atmospheric Oxygen and food that sustain the majority of life on Earth.

The process uses sunlight to convert water and Carbon Dioxide into Carbohydrates and Oxygen. It works into two stages : The Light Dependent Reaction and The light Independent Reaction. In Senior High School, generally known as Aerob Reaction and Anaerob Reaction.

The First stage is The Light Dependent Reaction. In this first step of Photoshnythesis, sunlight enters the first Photosystem and energizes the Chlorophyll.
The excited Chlorophyll splits water into Oxygen and Hydrogen. Meanwhile, the chlorophyll feeds electrons into a complex sequence of nearby molecules called the electron transport chain.
The freed Oxygen escapes into Athmosphere, While the freed Hydrogen is used later in The light Independent Reaction.
As electrons move along the electron transport chain, their energy make the molecule ATP, which is used by all known forms of life to fuel their cellular functions.
The electrons enter a second Photo system, get full energized by sunlight, and move along another electron transport chain to construct a molecule called NADP.
The second stage is The Light Independent Reaction. NADP combines with Hydrogen, which was freed earlier in The Light Dependent Reaction, to produce NADPH.

NADPH, ATP, and Choloroplast Enzyme called Rubisco, work together to create sugars and other Carbohydrates from Carbon Dioxide and Water in a Process called The Calvin Benson Cycle. It is a very complex reaction that Fixes Carbon from the Athmosphere forming The Foundation of Earth’s major food chains plants directly use sugar as their food, and many other organisms eat plants to gain their stored energy.

We can also conclude that Photosynthesis is how plants use light and water to make sugar and It is created in the green parts of a plant and every animal on earth depends on it. So, Without plants we would have no food to eat or oxygen to breath.

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