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Problem 4 - Entrance Test

A pea plant fixed 0.12 g of nitrogen via Rhizobium in 4 days. If 1 g N requires 20 kJ of plant ATP, calculate the average ATP spent per hour.

Correct: A

0.12 g N → 0.12×20 kJ = 2.4 kJ = 2400 J in 96 h. Rate = 2400/96 = 25 J h⁻¹.