Question

Which of the following statements about biofuels is true?
a.
Biofuels are composed of 100% renewable materials.
b.
Algae is the leading source of biofuels.
c.
Energy processing from corn biofuels is not energy efficient.
d.
Corn is the only source of biofuels.


Please select the best answer from the choices provided

A
B
C
D

Answer 1

C

Corn-based biofuels (e.g., corn ethanol) have a relatively low energy return — the energy output is only slightly higher than the energy input required for growing, harvesting and processing, making them not very energy-efficient compared with other biofuel sources.