The Light Reaction Of Photosynthesis

Light Reaction Definition

"Light reaction is the process of photosynthesis that converts energy from the sun into chemic energy in the form of NADPH and ATP."

What is Light Reaction?

The light reaction is too known as photolysis reaction and takes place in the presence of light. It normally takes place in the grana of chloroplasts.

The photosystems have pigment molecules. In the plants, chlorophyll is 1 of the primary pigments which actively takes part in the procedure of light reactions similar photosynthesis. The accompaniment pigments include carotenoids. The energy from the sun is absorbed by the chlorophyll in the thylakoid membrane of the chloroplasts. The energy is then transferred to ATP and NADPH that is generated by two-electron transport chains. Water is used and oxygen is released during the procedure.

Permit us take an overview of light reaction and the mechanism involved in light reaction.

Also Read:Circadian and non-cyclic photophosphorylation

Procedure of Light Reaction

Calorie-free reaction is the first stage of photosynthesis procedure in which solar free energy is converted into chemical energy in the form of ATP and NADPH. The protein complexes and the paint molecules help in the production of NADPH and ATP.

The process of light reaction is given beneath-

In low-cal reactions, free energy from the sunlight is absorbed past the pigment chlorophyll and is converted into chemic energy in the form of electron charge carrier molecules such as NADPH and ATP.

Light energy is utilized in both the Photosystems I and II, present inside thylakoid membranes of the chloroplasts.

The carbohydrate molecules are obtained from the carbon dioxide from the use of chemical energy gathered during the reactions.

The Lite energy tends to carve up into the water and later extracts the electrons from the photosystem II; then the electrons move from the PSII to b6f (cytochrome) to the photosystem I (PSI) and reduce in the form of energy.

The electrons are re-energized in the Photosystems I and the electrons of high energy reduce NADP+ into NADPH.

In the procedure of non-cyclic photophosphorylation, the cytochrome uses the electron energy from Photosystem II to pump the ions of hydrogen from the lumen to stroma; later, this energy allows the ATP synthase to bind to the third phosphate group to the ADP molecule, which and so forms the ATP.

In the procedure of circadian photophosphorylation, the cytochrome b6f uses electron energy from both the Photosystems I and 2 to create a number of ATP and stops the production of the NADPH, thus maintaining the right quantities of ATP and NADPH.

Thus, the light reactions harness the light free energy to drive the transport of electrons and the pumping of the proton, to convert the energy from the low-cal into the biologically useful form ATP and produces a usable source of reducing the ability NADPH.

Also Read: Difference between Light and Night Reaction

Key Points on Light Reaction

The light reaction traps the free energy from the sunday and converts it into chemical free energy that is stored in NADPH and ATP.
Oxygen is released equally the waste product.

As well Read:Electron Transport Chain

To know more nigh light reaction and the procedure involved in lite reaction, keep visiting BYJU'S website or download BYJU'South app for further reference.

The Light Reaction Of Photosynthesis,

Source: https://byjus.com/biology/light-dependent-reactions/#:~:text=%E2%80%9CLight%20reaction%20is%20the%20process,form%20of%20NADPH%20and%20ATP.%E2%80%9D

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