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Non Cyclic Photo-phosphorylation: Electron Excitation Video Lecture | Biology for ACT

FAQs on Non Cyclic Photo-phosphorylation: Electron Excitation Video Lecture - Biology for ACT

1. What is non-cyclic photo-phosphorylation?

Ans. Non-cyclic photo-phosphorylation is a process that occurs during photosynthesis, specifically in the light-dependent reactions. It involves the excitation of electrons in photosystem II and photosystem I, which leads to the production of ATP and NADPH.

2. How does electron excitation occur in non-cyclic photo-phosphorylation?

Ans. Electron excitation in non-cyclic photo-phosphorylation occurs when photons of light are absorbed by pigments, such as chlorophyll, in the photosystems. These absorbed photons provide energy to the electrons, causing them to become excited and move to higher energy levels.

3. What is the role of ATP in non-cyclic photo-phosphorylation?

Ans. ATP (adenosine triphosphate) is a molecule that serves as an energy currency in cells. In non-cyclic photo-phosphorylation, ATP is produced through a series of electron transfer reactions. The energy from excited electrons is used to pump protons across a membrane, creating a proton gradient. This gradient is then utilized by ATP synthase to generate ATP.

4. How does non-cyclic photo-phosphorylation differ from cyclic photo-phosphorylation?

Ans. Non-cyclic photo-phosphorylation and cyclic photo-phosphorylation are two different pathways in photosynthesis. In non-cyclic photo-phosphorylation, both photosystem II and photosystem I are involved, and both ATP and NADPH are produced. In contrast, cyclic photo-phosphorylation only involves photosystem I and produces ATP without the production of NADPH.

5. What are the consequences of non-cyclic photo-phosphorylation?

Ans. Non-cyclic photo-phosphorylation plays a crucial role in the production of ATP and NADPH, which are essential for the Calvin cycle, the second stage of photosynthesis. ATP provides energy for various cellular processes, while NADPH acts as a reducing agent in the conversion of carbon dioxide to glucose during the Calvin cycle. Without non-cyclic photo-phosphorylation, the overall process of photosynthesis would be incomplete, leading to a reduced production of glucose and other organic compounds.

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Oct 01, 2025 Last updated

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