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.
The Correct Answer and Explanation is :
The correct answer is c. Energy processing from corn biofuels is not energy efficient.
Explanation:
Biofuels are fuels derived from organic materials, typically plant-based, and are considered renewable because they can be replenished through agricultural processes. However, not all biofuels are equally efficient or sustainable.
- a. Biofuels are composed of 100% renewable materials: This statement is not entirely true. While biofuels are renewable, they are not always composed of 100% renewable materials. For example, some biofuels require the use of fertilizers, pesticides, and energy inputs that may not be renewable. Additionally, the processing of biofuels often involves fossil fuels, reducing their overall renewable impact.
- b. Algae is the leading source of biofuels: Although algae has potential as a biofuel source due to its high oil content and rapid growth rate, it is not yet the leading source of biofuels. Currently, corn and sugarcane are more widely used to produce ethanol and other biofuels. Algae biofuels are still in the research and development phase and face challenges in terms of scaling up production.
- c. Energy processing from corn biofuels is not energy efficient: This statement is accurate. The energy required to grow, harvest, transport, and process corn into biofuels (such as ethanol) can sometimes exceed the energy output of the biofuel itself. This is especially true when considering the use of fossil fuels in farming machinery, the energy used in distillation processes, and other inputs. Critics argue that the energy return on investment (EROI) for corn-based biofuels is low compared to other energy sources.
- d. Corn is the only source of biofuels: This is false. While corn is a common source of biofuels, many other crops can also be used, including sugarcane, soybeans, switchgrass, and algae. Various biofuel types exist, including ethanol, biodiesel, and biogas, sourced from a wide range of organic materials.
In conclusion, while biofuels can be a renewable energy source, the energy efficiency and sustainability of the materials and processes used vary, with corn-based biofuels being less efficient than alternatives.