Amazing Photosynthesis By jesse unger

Photosynthesis is when plants use the suns light or any light to make food.
Here is the equation for photosynthesis.

Photosynthesis occurs in two phases. The first phase is light dependent reactions then the second phase is light independent reactions.

This is the first phase light dependent reactions. What happens is plants capture light energy, then two energy storage molecules NADPH and ATP are produced to be used in the reaction.
Chloroplasts capture the light energy and that have two compartments essential to photosynthesis. The first is thylakoids. Thylakoids are the flattened sack like membranes that are in stacks. The second compartment is stroma. The stroma is the fluid filled space around the grana whic is important for phase two of photosynthesis.
Electron transport. Thylakoid membranes have a large surface are which is needed to store more electron transporting molecules and protein complexes called photosystems. There are two photosystems, photosystem 1 and 2 they both contain light absorbing molecules and proteins that are important roles to light reactions.

There are 5 steps on how the electron goes threw the thylakoid membrane.

Step 1. The light energy excites the electrons in photosystem 2 which causes the water molecule to split which releases an electron into the eletron transport system. A hydrogen ion into the thylakoid space and oxygen as a waste product. Water is essential for photosynthesis to occur.

Step 2/3 Then the excited electron moves from photosystem 2 to an electron-acceptor molecule in the thylakoid membrane. The eletron acceptor molecule transfers the eletron to a series of electron-carriers to photosystem 1

Step 4. In the presence of light the photosystem 1 transfers the eletron to a protein called ferrodoxin. The electrons lost by photosystem 1 are then replaced by photosystem 2.

Step 5. Finally ferrodoxin transfers the electrons to the electron carrier NADP+, forming the energy-storage molecule NADPH.

Phase two: Calvin cycle (light independent reaction)

Here are the four steps of the Calvin cycle.

Step 1. Carbon fixation. 6 carbon dioxide (co2) molecules combine with 6 five carbon compounds that form 12 three carbon molecules called 3-phosphoglycerate.

Step 2. The chemical energy that is stored in ATP and NADPH is transfered to the 3-PGA that then form high energy molecules that are called glyceraldehyde 3-phosphates. ATP supplies the phosphate groups while NADPH supplies hydrogen electrons and ions.

Step 3. 2 three PGA molecules leave the cycle to be used for the making of glucose and other compounds.

Step 4. A enzyme called rubisco combines with the remaining ten G3P molecules into 5-carbon molecules called ribulose 1, 5-bisphosphate. Then they combine with new carbon dioxide molecules to continue the cycle.


Created with images by Freeimages9 - "leaf background lines" • Always Shooting - "Bloody Sunrise" • wilhei - "electricity voltage light" • spiterek - "after the rain 2" • Hans - "gazanie blossom bloom" • Hans - "gazanie blossom bloom" • oom_endro - "rose orange flower"

Made with Adobe Slate

Make your words and images move.

Get Slate

Report Abuse

If you feel that this video content violates the Adobe Terms of Use, you may report this content by filling out this quick form.

To report a Copyright Violation, please follow Section 17 in the Terms of Use.