Question:

As compared to a C3 plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4 plants :

Updated On: Jun 23, 2024
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The Correct Option is D

Solution and Explanation

In C4 plants, each CO2 molecule must undergo fixation twice, resulting in a higher energy requirement for the synthesis of hexose sugar molecules compared to C3 plants, where CO2 is fixed only once. C3 plants require 18 ATP molecules to synthesize one molecule of hexose sugar, whereas C4 plants require 30 ATP molecules for the same process. Therefore, C4 plants require an additional 12 ATP molecules compared to C3 plants to produce one molecule of hexose sugar.

So, the correct option is (D); 12

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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)