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Light and Dark Reactions in Photosynthesis Written by tutor Kathie Z

Ultimately the light energy ends up in the glucose, but it does not get their easily.




The dark reaction depends on the light reaction for energy, just as this computer depends on electricity.

The chemical equation is written below which summarizes the chemical reactions of photosynthesis.

The enlargement is shown below.




The light reactions of photosynthesis are actually an electron pumping system located on the thylakoids of the chloroplast.

Photosynthetic: Light reactions/Dark reactions | New …

Photosynthesis is actually much more complex than what is represented by the equation below.

The glucose produced by the dark reaction would then be used by the plant cell who made it for food.





In the next and final animation, the dark and light reaction are shown occurring simultaneously.

The faster the cylce "turns" or reacts, the more glucose that is made per minute.





In the following animation, the dark reaction is shown in operation.

So we can write the general equation for photosynthesis

(don't count water made in dark rx)Diagram - Name the following photosynthesis molecules or structures.

It turns out that the dark reaction produces 6 water molecules as it works (shown in simulation) , so that the process overall only USES six.




Within a chloroplast, many thylakoids are present, along with many enzymes and NADP molecules.

The products of the dark reaction are glucose and more RuBP, mostly RuBP.





Six "turns" of the calvin cycle (dark reaction) are needed to produce a single molecule of glucose.

A chemical equation is written below which summarizes the reactants and products of the photosynthesis pathway.
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Light and dark reactions in photosynthesis - eschooltoday

The dark reactions serve as a sugar factory, using carbon dioxide and H atoms as raw materials to make sugar.





The light reaction trapped the solar energy and transferred it to the dark reaction via ATP so that the dark reaction had the energy to make glucose.

in a series of dark reactions, ..

To be more specific, the light reactions take place on the surface of the thylakoid membranes, and the dark reaction takes place in the stroma fluid.

then the equation for photosynthesis would have to be rewritten:






The complex process of photosynthesis actually consists of TWO interrelated complex reactions -- the LIGHT and DARK reactions.

This tutorial introduces photosynthesis

Note: the light reaction does not take place inside of the thylakoid, only on its surface.




There are special pigments found in a chloroplast, which function in photosynthesis, that are found nowhere else in a plant.

The Characteristics, Equation and Stages of Photosynthesis

ATP is involved in other chemical reactions, such as respiration, which will be covered in a later program.




Photosynthesis converts moving radiant energy into stored chemical bond energy.

Photosynthesis: Crash Course Biology #8 - YouTube

The hydrogen ions are then used to produce ATP by a process called Chemiosmosis.




At the end of the electron transport chain, the electrons are picked up, along with hydrogen ions, by a special molecule called NADP which carries them to the dark reaction.





Remember, the purpose of the light reaction was to produce ATP and H atoms for the dark reaction.

Photosynthesis- Ideas for Teaching, Resources for …

By 1796, after further research, Ingenhousz was able to write the first equation for photosynthesis, which was:



Light is not directly usable in photosynthesis.

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