Contents
Where does the light-dependent reaction occur in photosynthesis?
thylakoids
grana). The light-dependent reactions of photosynthesis take place within the thylakoids. These reactions occur when the pigment chlorophyll, located within the thylakoid membranes, captures energy from the sun (photons) to initiate the breakdown of water molecules.
Where do light reactions occur?
thylakoid discs
The light reaction takes place in the thylakoid discs. There, water (H20) is oxidized, and oxygen (O2) is released. The electrons freed up from water are transfered to ATP and NADPH. The dark reaction occurs outside of the thylakoids.
What are light-dependent reactions and where do they occur?
The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.
Where does light Dependant occur?
The light-dependent reactions take place in the thylakoid membranes in the granum (stack of thylakoids), within the chloroplast.
Do light-dependent reactions produce oxygen?
In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water. The light-dependent reactions release oxygen as a byproduct as water is broken apart.
What are the 4 steps of light reactions?
Here are the basic steps:
- Light absorption in PSII. When light is absorbed by one of the many pigments in photosystem II, energy is passed inward from pigment to pigment until it reaches the reaction center.
- ATP synthesis.
- Light absorption in PSI.
- NADPH formation.
What do light-dependent reactions produce?
The overall purpose of the light-dependent reactions is to convert solar energy into chemical energy in the form of NADPH and ATP. This chemical energy will be used by the Calvin cycle to fuel the assembly of sugar molecules.
What are light-dependent reactions?
Light-dependent reactions happen in the thylakoid membrane of the chloroplasts and occur in the presence of sunlight. The sunlight is converted to chemical energy during these reactions. The chlorophyll in the plants absorb sunlight and transfers to the photosystem which are responsible for photosynthesis.
What are the steps in a light-dependent reaction?
These reactions occur within specialised membrane discs within the chloroplast called thylakoids and involve three steps: Excitation of photosystems by light energy. Production of ATP via an electron transport chain.
Where does the light dependent reaction take place?
Light-Dependent Reaction is a photochemical reaction taking place in all green coloured plants within the thylakoid membranes of the chloroplast.
What happens in the light dependent phase of photosynthesis?
Photosynthesis occurs in two phases: 1) in the presence of light, called light-dependent reaction, and 2) in the absence of light, called light-independent reaction or dark reaction, also known as the Calvin cycle. The light energy is trapped by a pigment in the chloroplast and converted into chemical energy.
Where does the light reaction take place in plants?
The light reaction is also known as photolysis reaction and takes place in the presence of light. It usually takes place in the grana of chloroplasts. The photosystems have pigment molecules. In the plants, chlorophyll is one of the primary pigment which actively takes part in the process of light reactions like photosynthesis.
Where does the energy for the light reaction come from?
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.