Question:

Which of the following do not evolve $O_2$?

Updated On: Aug 15, 2022
  • green algae
  • blue-green algae
  • autotrophic plants
  • photosynthetic bacteria
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The Correct Option is D

Solution and Explanation

Photosynthetic bacteria are of 2 types - phototrophs and chemotrophs . Phototrophs carry out photoprepare their food using chemicals from surrounding medium. Photosynthetic bacteria shows only cyclic photophosporylation where splitting (photolysis) of water does not take place. Hence, $O_{2}$ is not released.
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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)