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Transcript of Photosynthesis
Starting with Light Reactions, the first called a Light-Dependent Reaction:
It makes Enzymes, (special proteins), speed up reactions and remove electrons from H O
Beginning with sunlight (one input(also said as light energy)), there are reactions that occur from it. The light-dependent reaction requires sunlight and it begins by hitting chlorophyll molecules in chloroplasts. The light makes the electrons to become excited and makes the energy levels high. This starts series of reactions to turn light energy into adenosine triphosphate (ATP), -A form of chemical energy very important for cells.
While all this light is being inputed, Carbon Dioxide gas goes into the chloroplasts and water is also inputed through the roots differently...
This phase doesn't need light, but does need ATP, even though this reaction does occur during the light. (Or when light is around.)
ATP is needed to make these 2 reactions.
This reaction supplies plants with carbohydrates that give energy.
The Light-Independent Reaction's carbon molecules combine to make sugars. (A form of chemical energy). Another input, Carbon Dioxide gas, is going into the chloroplast and 3-carbon sugars conclude on going out.
The source of the carbon molecules are the atmospheric carbon dioxide, it is added to the existing 5-carbon sugar, making two 3-carbon sugars. (This is called Carbon Fixation) C.F., fixing carbon into an organic molecule. The 3-carbon sugars produced during photosynthesis supply energy and carbon skeletons for the entire plant.
Some carbohydrates that also supply plants (and animals) with energy are glucose, sugars ( for example: read above), and starch.
Active transport helps the plant accumulate what it needs, just like above, for example: Glucose.
What is photosynthesis?
The process that plants (and other organisms) use to convert light energy, (mostly from the sun), into chemical energy to later be used for the organisms activity.
By Aranza M. Torres-Silva
What Are The Inputs?
Well, you should know the equation of photosynthesis to understand more:
Light + 3CO +3H O --- C H O + 3O
3 carbon sugar
Some inputs that go into plants are:
Sun light (Light Energy)
H O (Water)
CO (Carbon Dioxide gas)
Photosynthesis: Can't occur without water
Plants absorb water through their roots.
Splitting it into O
and H+ ions
Summing up the reactions:
Numerous chloroplasts are where photosynthesis reactions occur
In the Light-Dependent Reactions: absorption of light energy by the chlorophyll occur
That starts a series of chemical reactions:
Results: Production of ATP & Oxygen (an output) from Water (an input)
Series of reactions use carbon atoms from carbon dioxide to build sugars, extra energy (carbohydrates.) (Going out while Carbon goes into chlorophyll cells)
ATP provides energy for the reactions
Carbon fixation has the waste product of carbon dioxide being converted into sugars.
Get oxygen from water
Therefore, photosynthesis uses these things to provide energy for plants to live.
Photosynthesis Chemical Reaction:
Sunlight, it is absorbed by the plants leaves. (Absorbed by the green pigments (chlorophyll))
Furthermore the water helps the plant stay cool and moist. It's a reactant in the photosynthesis reaction, they provide electrons to replace the the other electrons removed from chlorophyll.
Extra info: Light Energy:
Like glucose (A carbohydrate): it may also move through the cell membrane but by using transport proteins (which then is Passive Transport.). (Only certain size molecules can move through the cell membrane.)
3 carbon sugars
What are the outputs?
How do these inputs "go in"?
Photosynthesis has 2 stages of light reactions needed
Water is one other input in photosynthesis
O is given off as a by-product.
Water moves in and out of cells, by diffusion (of water) across the membranes.
---> Important in Biology: Which is then called Osmosis
Some outputs include: