Photooxidation of water in photosynthesis is in association ofa)Cytochrome b6b)Pigment system - Ic)Pigment system - IId)PlastocyaninCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Answer

Photo oxidation or photolysis of water takes place with the help of water splitting complex or oxygen evolving complex. this complex is situated in ps-ll that's why we can say that photo oxidation of water takes place in ps-ll

Answer

Oxygen evolving Complex is in association with PS2
so option C

Answer

The correct answer is option 'C' - Pigment system - II.

Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. This process involves two main reactions: the light-dependent reactions and the light-independent reactions.

The light-dependent reactions occur in the thylakoid membrane of the chloroplasts and involve the absorption of light energy by pigments, which are molecules that can absorb specific wavelengths of light. These pigments are organized into two photosystems, known as Photosystem I (PSI) and Photosystem II (PSII).

Photooxidation of water is the process by which water molecules are split into oxygen, protons (H+), and electrons (e-) in the thylakoid lumen during the light-dependent reactions of photosynthesis. This process occurs in association with the pigment system - II.

Here is a detailed explanation of the association of photooxidation of water with pigment system - II:

1. Photosystem II (PSII)
- PSII is the first photosystem encountered by light during the light-dependent reactions.
- It contains several pigments, including chlorophyll a, chlorophyll b, and carotenoids, which are responsible for absorbing light energy.
- When light is absorbed by the pigments in PSII, it excites electrons, which are then passed on to an electron acceptor molecule called pheophytin.

2. Water Splitting
- The excited electrons from PSII are replaced by electrons derived from the oxidation of water molecules.
- This process involves the transfer of four electrons from two water molecules to the oxygen-evolving complex (OEC) in PSII.
- The OEC is a protein complex that catalyzes the oxidation of water, releasing molecular oxygen (O2), protons (H+), and electrons (e-).

3. Electron Transport
- The released electrons from the water splitting reaction are transferred through a series of electron carriers in the thylakoid membrane, including plastoquinone (PQ) and cytochrome b6f complex, ultimately leading to the reduction of NADP+ to NADPH.

4. Proton Gradient
- The protons (H+) released from the water splitting reaction contribute to the formation of a proton gradient across the thylakoid membrane.
- This proton gradient is essential for the production of ATP through chemiosmosis, which is another important product of the light-dependent reactions.

In conclusion, the photooxidation of water in photosynthesis is specifically associated with the pigment system - II (PSII). PSII absorbs light energy, excites electrons, and initiates the process of water splitting, leading to the production of oxygen, protons, and electrons.

Answer

Splitting  of water takes place in ps-ll releases nacent oxygen  and  electrons  and H+ .

Answer

During non-cyclic electron flow, the electron hole in P-680 (reaction center of pigment system- II) is filled by electrons obtained by photolysis of water. The photolysis is an oxidative process and means splitting of water in the presence of light to form oxygen, protons and electrons. As a result, there is the evolution of oxygen and the electron move through Mn-protein bound to PS- II.

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