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What special pigment do plant cells contain?
Chlorophyll in the chloroplasts and other accesory pigments (p680 in PSII and p700 in PSI)
Why photolysis of water takes place at PSII and not at PSI in thallakoid channel?
Photolysis of water occurs at Photosystem II (PSII) because it has a higher oxidation potential than Photosystem I (PSI). This higher potential allows PSII to extract electrons from water molecules during the light-dependent reactions of photosynthesis. Additionally, the location of the water-splitting complex is specific to PSII, where it is positioned near the oxygen-evolving complex that facilitates water splitting.
What steps of the light reactions is sunlight absorbed?
Sunlight is absorbed during the light reactions of photosynthesis primarily in the chlorophyll molecules located in the thylakoid membranes of chloroplasts. This absorption occurs in two main photosystems: Photosystem II (PSII) and Photosystem I (PSI). In PSII, light energy excites electrons, which initiates a series of reactions that ultimately lead to the splitting of water molecules and the release of oxygen. In PSI, absorbed light further energizes electrons to help produce NADPH, a crucial energy carrier in the process.
Where are PSI and PSII located?
Photosystem I (PSI) and Photosystem II (PSII) are located in the thylakoid membranes of chloroplasts in plant cells. PSII is situated at the beginning of the photosynthetic electron transport chain, while PSI is located further along the chain. Both systems play crucial roles in the light-dependent reactions of photosynthesis, facilitating the conversion of light energy into chemical energy.
What catches sunlight during photosynthesis?
Photo systems embedded on the thylakoid membranes catches light. photo systems are of two type PSII and PSI. photo systems consists of chlorophyll and accessory pigments. these catch the sunlight for the process of photosynthesis.
Are the chlorophyll molecules in PSI and PSII the same?
No, the chlorophyll molecules in Photosystem I (PSI) and Photosystem II (PSII) are not the same. They differ in absorption spectra and redox properties, allowing them to play distinct roles in the light reactions of photosynthesis.
What special pigment do plant cells contain?
Chlorophyll in the chloroplasts and other accesory pigments (p680 in PSII and p700 in PSI)
Why photolysis of water takes place at PSII and not at PSI in thallakoid channel?
Photolysis of water occurs at Photosystem II (PSII) because it has a higher oxidation potential than Photosystem I (PSI). This higher potential allows PSII to extract electrons from water molecules during the light-dependent reactions of photosynthesis. Additionally, the location of the water-splitting complex is specific to PSII, where it is positioned near the oxygen-evolving complex that facilitates water splitting.
What steps of the light reactions is sunlight absorbed?
Sunlight is absorbed during the light reactions of photosynthesis primarily in the chlorophyll molecules located in the thylakoid membranes of chloroplasts. This absorption occurs in two main photosystems: Photosystem II (PSII) and Photosystem I (PSI). In PSII, light energy excites electrons, which initiates a series of reactions that ultimately lead to the splitting of water molecules and the release of oxygen. In PSI, absorbed light further energizes electrons to help produce NADPH, a crucial energy carrier in the process.
What is the difference between PSI and PSII?
PSI (Photosystem I) and PSII (Photosystem II) are two different protein complexes in the thylakoid membrane of chloroplasts involved in the light-dependent reactions of photosynthesis. PSII functions first in the electron transport chain by absorbing light energy to oxidize water and generate oxygen, while PSI receives electrons from PSII and drives the production of NADPH for the Calvin cycle.
Where are PSI and PSII located?
Photosystem I (PSI) and Photosystem II (PSII) are located in the thylakoid membranes of chloroplasts in plant cells. PSII is situated at the beginning of the photosynthetic electron transport chain, while PSI is located further along the chain. Both systems play crucial roles in the light-dependent reactions of photosynthesis, facilitating the conversion of light energy into chemical energy.
What is one way photo system 2 and photo system 1 are simmalar and one way theur diffrent?
Both Photosystem II (PSII) and Photosystem I (PSI) are integral components of the photosynthetic electron transport chain in plants, algae, and cyanobacteria, and they both play crucial roles in capturing light energy to drive the process of photosynthesis. However, they differ in their functions; PSII primarily captures light energy to split water molecules and generate oxygen, while PSI primarily facilitates the reduction of NADP+ to NADPH. Additionally, PSII operates earlier in the light-dependent reactions compared to PSI.
What catches sunlight during photosynthesis?
Photo systems embedded on the thylakoid membranes catches light. photo systems are of two type PSII and PSI. photo systems consists of chlorophyll and accessory pigments. these catch the sunlight for the process of photosynthesis.
What are the clusters of photosystems?
The two clusters of photosystems in plants are Photosystem I (PSI) and Photosystem II (PSII). PSII functions first in the photosynthetic electron transport chain, followed by PSI, and they work together to absorb light energy and carry out the reactions of photosynthesis.
How is H electrochemical gradient established and maintained in photosynthesis?
The formation of NADPH, the movement of electrons from PSII to PSI, & the splitting of water
How is light energy processed in the light reaction of photosynthesis?
In simple terms, photosynthesis is the conversion of carbon dioxide (CO2) to carbohydrate (CH2O). To do this two things are needed: energy to drive the reaction and a source of hydrogen. The light reaction of photosynthesis produces two essential substances: ATP and NADPH. ATP provides the energy for the conversion of CO2 to CH2O, and NADPH provides the hydrogen. The light reaction depends on groups of chlorophyll molecules, called photosystems, absorbing light energy. The energy is used to eject high energy electrons from the chlorophyll. The energy in the electrons is then used to make ATP and NADPH. There are two photosystems, called photosystem I (PSI) and photosystem II (PSII), which work in sequence. (PSII comes before PSI in the sequence, but they were discovered and named in the reverse order!). PSII absorbs light and emits a high energy electron. The energetic electron then passes down a series of molecules, called an electron transport chain (ETC), releasing energy as it goes (you can visualise it as a ball bouncing down a set of stairs, losing energy as it falls). The energy released is used to make the energy carrier compound ATP. To replace the electrons lost from chlorophyll in PSII water (H2O) is split into hydrogen ions (H+), electrons (e-) and oxygen atoms (O): H2O = 2H+ + 2e- + O This is the source of the oxygen released by photosynthesis. The second photosystem, PSI, also absorbs light and emits a high energy electron from chlorophyll. The energy in this electron is used to drive the synthesis of NADPH from NADP+ ,hydrogen ions (H+) and electrons (e-): NADP+ + 2H+ + 2e- = NADPH + H+ The hydrogen ions needed for this come from the water which was split by PSII. The electrons lost from the chlorophyll in PSI are replaced by the electrons ejected from PSII. The result of all this is that light energy is converted into chemical energy in ATP, water is split to provide the hydrogen needed to make NADPH, and oxygen is released as a waste product. The ATP and NADPH are then used in the light independent reaction (the Calvin cycle) to concert carbon dioxide into carbohydrate.
What photosystems are embedded in the electron transport chain?
PSII, PSI, cytocromes, ferrodoxins are the part of ETC. They transport the protons to ATPase to produce ATP.
