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Question: Answered & Verified by Expert
As compared to a $\mathrm{C}_3$-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by $\mathrm{C}_4$-plants?
BiologyPhotosynthesis in Higher PlantsNEETNEET 2005
Options:
  • A two
  • B $\operatorname{six}$
  • C twelve
  • D zero.
Solution:
2393 Upvotes Verified Answer
The correct answer is: twelve
18 ATP molecules are required by $\mathrm{C}_3$ plants for the synthesis of one molecule of hexose sugar while 30 ATP molecules are needed by the $\mathrm{C}_4$ plants for the same. Thus, $\mathrm{C}_4$ plants have a need of 12 ATP molecules extra than $\mathrm{C}_3$ plants for the synthesis of one molecule of hexose sugar.

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