Q34 / 200 · NEET 2005 · Botany

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?

  • A
    two
  • B
    $\operatorname{six}$
  • Correct answer
    C
    twelve
  • D
    zero.

Solution

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.

Hence, the correct answer is option: 'C'.

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