ADP + iP = ATP in grana is called :a)Phosphorylationb)Oxidative phosphorylationc)Photophosphorylationd)PhotolysisCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Photophosphorylation is the process in which light energy is converted into chemical energy through the production of ATP. It is the process of formation of ATP from ADP and inorganic phosphate (IP) utilizing light energy. It occurs in grana of chloroplast during photosynthesis...Thus, option C is right ans..

Answer

In the process of photosynthesis, the phosphorylation of ADP to form ATP using the energy of sunlight is called photo phosphorylation

Answer

Photophosphorylation in Grana

Photophosphorylation is a process that occurs during photosynthesis, specifically in the grana of chloroplasts. Grana are stacks of thylakoid membranes found within the chloroplasts of plant cells. This process involves the conversion of ADP (adenosine diphosphate) to ATP (adenosine triphosphate) using the energy from light.

Process of Photophosphorylation

During the light-dependent reactions of photosynthesis, light energy is absorbed by the pigments in the thylakoid membrane, including chlorophyll. This energy is then used to excite electrons in photosystem II, which leads to the transfer of electrons through a series of electron carriers in the electron transport chain.

1. Electron Transport Chain:
The excited electrons from photosystem II are passed down the electron transport chain, releasing energy at each step. This energy is used to pump protons (H+) from the stroma into the thylakoid lumen, creating a proton gradient.

2. ATP Synthase:
The proton gradient drives the movement of protons through ATP synthase, an enzyme located in the thylakoid membrane. As the protons move through ATP synthase, ADP and inorganic phosphate (Pi) molecules combine to form ATP.

3. Chemiosmosis:
This process, known as chemiosmosis, allows for the generation of ATP from ADP and Pi. The flow of protons through ATP synthase provides the energy needed for the synthesis of ATP.

Importance of Photophosphorylation

Photophosphorylation is essential for the production of ATP, which is an energy-rich molecule used by cells for various metabolic processes. ATP is required for activities such as cellular respiration, active transport, DNA replication, and muscle contraction. Without the production of ATP through photophosphorylation, plants and other photosynthetic organisms would not be able to store and utilize the energy from sunlight effectively.

In conclusion, photophosphorylation in the grana of chloroplasts is the process of converting ADP to ATP using the energy from light during the light-dependent reactions of photosynthesis. This process is crucial for the production of ATP, which serves as the primary energy currency in cells.

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