Question:

Phototrophs and chemotrophs are defined on the basis of their

Updated On: Jun 21, 2022
  • energy source
  • requirement of organic and inorganic substances
  • metabolism
  • structure.
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The Correct Option is A

Solution and Explanation

Organisms which prepare their food themselves are called autotrophs. Autotrophs may be phototrophs or chemotrophs depending upon the energy source. When the energy .to initiate organic food synthesis is obtained from light rays the process is called phototrophism and the organisms are called phototrophs. But when oxidation of inorganic chemical compounds provide this energy, the organisms are called chemotrophs.
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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)