Hydrogen is a leading candidate in the search for a petroleum replacement. However, the hydrogen-generating reaction requires more energy than it produces. Why are plants considered to be one step ahead in the utilization of hydrogen as an alternative fuel source?
A) Plant cells break down carbohydrates to generate hydrogen.
B) Plant cells possess water-splitting enzymes.
C) Plant cells convert carbon to combustible hydrogen.
D) Plant cells harness the ATP produced during photosynthesis to split water.
Answer: B