Dark Reaction

Light Reaction

In the presence of light, this phenomenon takes place. As the pigment absorbs light, ATP is created, which is energy. The process includes light absorption, water splitting, oxygen release, and the production of ATP and NADPH. Two photosystems, PS-I and PS-II, both contain light-harvesting complexes made up of protein-bound pigment molecules. Each photosystem consists of antennae carrying auxiliary pigments and a reaction centre made up of chlorophyll a molecule. The reaction centre for PS-I is at P-700 because chlorophyll has an absorption peak at that wavelength, while PS-is II’s at P-680 because it has a different absorption peak....

Dark Reaction

This process occurs not in the presence of light in the stroma of the chloroplasts. The following cycles are involved in the process: the C3 cycle and the C4 cycle. The Dark reaction is called the carbon-fixing reaction....

Photophosphorylation

Through the activation of PSII, photophosphorylation uses solar energy to convert ADP to ATP. In this, a process known as photolysis splits the water molecule into oxygen and hydrogen protons (H+). An ongoing, unidirectional flow of electrons from water to PS I is then carried out. Through the action of the enzyme ATP synthase, ATP is produced, and electrons travel spontaneously from donor to acceptor through an electron transport chain. A chain of redox reactions known as an “electron transport chain” sequentially transfers electrons from a high-energy molecule (the donor) to a lower-energy molecule (the acceptor)....

Cyclic Photophosphorylation

Photophosphorylation in a cycle. Cyclic photophosphorylation is the name given to the photophosphorylation procedure that leads to the cyclic movement of electrons during the synthesis of ATP molecules. In this procedure, plant cells only convert ADP to ATP to provide the cells with immediate energy....

Steps of Cyclic Photophosphorylation

These are some steps in cyclic photophosphorylation:...

Chemiosmosis

Ions move over a selectively permeable membrane along their electrochemical gradient is called Chemiosmosis. Higher H+ ion concentrations are found in the lumen and lower H+ ion concentrations are found in the stroma. The incursion of H+ ions during the electron transport by pq. ATP synthesis transport of these H+ ions. ATP synthase produces ATP. Because the released electrons in this photophosphorylation come back to the PS I, it is known as cyclic photophosphorylation....

Non-Cyclic Photophosphorylation

Photophosphorylation without a cycle. Non-cyclic photophosphorylation is the title given to the photophosphorylation process that causes the electrons to move non-cyclically in order to synthesise ATP molecules using the energy from excited electrons moved by photosystem II....

Water Splitting

Photolysis is the term for the light-dependent splitting of water. Manganese and chlorine both play significant roles in the PS-II process that is connected to this one. The electrons created during this procedure take the place of the electrons lost from P680. As a result of P680 absorbing light, a water molecule splits to liberate oxygen....

Number of electrons and protons

On both photosystems, 4 photons were employed instead of 2. As a result, all four electrons are utilised. Thus, 4 photons are consumed at photosystem-I and photosystem-II and 4 electrons move through both photosystems to produce 1 oxygen molecule....

Similarities between Cyclic and Non-cyclic Photophosphorylation

When photosynthesis occurs, both cyclic and noncyclic photophosphorylation take place. There are two types of photophosphorylation i.e. cyclic and noncyclic. Light is required for both cyclic and noncyclic photophosphorylation. ATP is produced by both cyclic and noncyclic photophosphorylation....

Difference between Cyclic & Non-cyclic Photophosphorylation

Cyclic Photophosphorylation Non-Cyclic Photophosphorylation Photosystem I experience it. It can be seen in both photosystems I and II. The only product is ATP. ATP and NADPH are generated. Electrons that the photosystem expels and then absorbs. Electrons that are ejected by the photosystem but do not reenter. Water does not undergo photolysis. Water is subject to photolysis. No oxygen is released. Release of oxygen....

FAQs on Cyclic and Non-Cyclic Photo-photophosphorylation

Question 1: What are two types of photophosphorylation?...