Question:

During non-cyclic photophosphorylation, electrons are continuously lost from the reaction centre of $PS II$. Which source is used to replace these electrons?

Updated On: Jul 6, 2022
  • Sunlight
  • $O_{2}$
  • $H_{2}O$
  • $CO_{2}$
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The Correct Option is C

Solution and Explanation

Non-cydic photophosphorylation is the normal process of photophosphorylation in which the electron expelled by the excited photocentre does not return to it. Non- cydic photophosphorylation is carried out in collaboration of both photosystems $I$ and $II$. Electron released during photolysis of $H_{2}O$ is picked up by photocentre of $PS II$ called $P_{680}$. The same is extruded out when the photocentre absorbs light energy ($hv$). Electrons released during the photolysis of water are immediately accepted by oxidised reaction centre of $PS II$ (i.e., $P_{680}$) through an unknown substance $Z$.
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Notes on Photosynthesis in higher plants

Concepts Used:

Photosynthesis in Higher Plants

Processes Of Photosynthesis in Higher Plants:

Photosynthesis in higher plants involves the following processes:

  • Light Reaction
  • Dark Reaction

Light Reaction:

  • This phenomenon occurs in the presence of light.
  • The pigment absorbs light and produces energy in the form of ATP.
  • The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.

Dark Reaction:

This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:

  1. Calvin Cycle (C3 Cycle)
  2. C4 Cycle (Hatch and Slack Pathway)