Press "Enter" to skip to content

What is split in the light-dependent reaction?

What is split in the light-dependent reaction?

The light-dependent reactions begin in photosystem II. In PSII, energy from sunlight is used to split water, which releases two electrons, two hydrogen atoms, and one oxygen atom.

What is the function of the splitting of water in the light-dependent reactions?

To replace the electron in the chlorophyll, a molecule of water is split. This splitting releases two electrons and results in the formation of oxygen (O2) and 2 hydrogen ions (H+) in the thylakoid space. The replacement of the electron enables chlorophyll to respond to another photon.

What happens during the light-independent reactions?

In the light-independent reactions or Calvin cycle, the energized electrons from the light-dependent reactions provide the energy to form carbohydrates from carbon dioxide molecules. After the energy is transferred, the energy carrier molecules return to the light-dependent reactions to obtain more energized electrons.

What are the requirements of light-independent reaction?

Light reactions harness energy from the sun to produce chemical bonds, ATP, and NADPH. These energy-carrying molecules are made in the stroma where carbon fixation takes place. The light-independent reactions of the Calvin cycle can be organized into three basic stages: fixation, reduction, and regeneration.

What are the raw materials of the light independent reaction?

In photosynthesis, oxygen, carbon dioxide, ATP, and NADPH are reactants. GA3P and water are products. In photosynthesis, chlorophyll, water, and carbon dioxide are reactants.

What is the purpose of Rubisco?

Ribulose-1,5-bisphosphate carboxylase oxygenase, most commonly known by the shorter name RuBisCO, is an enzyme that catalyses the first major step of carbon fixation, a process by which atmospheric carbon dioxide and water are converted to energy-rich molecules such as glucose, using sunlight.

What is the point of Photorespiration?

Photorespiration Protects from Photoinhibition. Under stress conditions, such as drought, cold, or high light, NADPH production in the light reactions of photosynthesis often exceeds the demand of the Calvin cycle for reducing power.