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in Biology by (46.4k points)

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.

(a) 2

(b) 6

(c) 12

(d) Zero

1 Answer

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Best answer

Correct option (c) 12

Explanation :

In C4 -plants every CO2 molecule has to be fixed twice, so these plants are needed more energy for the synthesis of hexose sugar molecules than C3 -plants in which CO2 has to be fixed only once. 18 ATP mclecules are required by C3-plants for the synthesis of one molecule of hexose sugar while 30 ATP molecules are needed by the C4 -plants for the same.  Thus, C4 -plants have a need of 12 ATP molecules extra than C3 -plants for the synthesis  of one molecule of hexose sugar.

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