Table of Contents
- 1 Where does photolysis occur in the chloroplast?
- 2 What happens to the electrons that are released during photolysis?
- 3 What happens in the light-dependent reactions of photosynthesis?
- 4 Does photolysis occur in the thylakoid?
- 5 Which reaction releases hydrogen ions inside the thylakoid?
- 6 Where do the light dependent reaction and the Calvin cycle occurs in the chloroplast?
- 7 How do light independent reactions depend on light-dependent reactions?
- 8 Why does the space inside the thylakoid become positively charged during the light-dependent reactions?
Where does photolysis occur in the chloroplast?
granum
This part of photosynthesis occurs in the granum of a chloroplast where light is absorbed by chlorophyll; a type of photosynthetic pigment that converts the light to chemical energy. This reacts with water (H2O) and splits the oxygen and hydrogen molecules apart.
What happens to the electrons that are released during photolysis?
When the electrons leave the chlorophyll molecules, it leaves behind a ‘hole. ‘ This electron hole is filled in by a water molecule that is oxidized, or loses electrons, as it essentially splits into two hydrogen atoms, or protons, and an oxygen atom.
Why do the light-dependent reactions of photosynthesis take place in the thylakoid of chloroplast?
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.
What happens in the light-dependent reactions of photosynthesis?
In light-dependent reactions, the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form of electron carrier molecules like ATP and NADPH. Light energy is harnessed in Photosystems I and II, both of which are present in the thylakoid membranes of chloroplasts.
Does photolysis occur in the thylakoid?
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. Reduction of NADP+ and the photolysis of water.
How does photolysis occur in photosynthesis?
Photolysis during photosynthesis occurs in a series of light-driven oxidation events. The energized electron (exciton) of P680 is captured by a primary electron acceptor of the photosynthetic electron transfer chain and thus exits photosystem II. This occurs by oxidation of water in the case of oxygenic photosynthesis.
Which reaction releases hydrogen ions inside the thylakoid?
photosynthesis
A photon strikes the antenna pigments of photosystem II to initiate photosynthesis. The energy travels to the reaction center that contains chlorophyll a to the electron transport chain, which pumps hydrogen ions into the thylakoid interior (the lumen). This action builds up a high concentration of hydrogen ions.
Where do the light dependent reaction and the Calvin cycle occurs in the chloroplast?
Light-dependent reaction takes place in the presence of light energy in thylakoid membranes (grana) of the chloroplast Calvin cycle occurs at the stroma of the chloroplast.
Which of the following are produced by reactions that take place in the thylakoids?
Light-dependent reactions
Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH. The Calvin cycle, which takes place in the stroma, uses energy derived from these compounds to make GA3P from CO2.
How do light independent reactions depend on light-dependent reactions?
In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. In the light-independent reactions, the chemical energy harvested during the light-dependent reactions drives the assembly of sugar molecules from carbon dioxide.
Why does the space inside the thylakoid become positively charged during the light-dependent reactions?
Why does the space inside the thylakoid become positively charged during the light dependent reactions? High energy electrons move thorugh the electron transport chain. Pigments in photosystems II and I absorb light. ATP synthase helps H+ ions in teh thylakoid space to pass through the membrane to the stroma.
What is the role of photolysis of water in light reaction of photosynthesis?
In oxygenic photosynthesis, water (H2O) serves as a substrate for photolysis resulting in the generation of diatomic oxygen (O2). This is the process which returns oxygen to Earth’s atmosphere. Photolysis of water occurs in the thylakoids of cyanobacteria and the chloroplasts of green algae and plants.