Unit 1.1 – Answers

  1. Answer: E. Bioenergy feedstocks are recently living biological materials; the energy for their growth comes from the sun, and if they are harvested at sustainable rates, bioenergy feedstocks are renewable
  2. Answer: C. Biomass is derived from multiple sources; most of these come from agriculture forests and waste. Biomass can also come from algaculture, or, the production of microalgae. Item b are three main sources of biomass from agriculture alone, but currently most feedstock material used for energy production is woody biomass.
  3. Answer: A. Thermal conversion technologies use heat to convert biomass into other forms. Chemical conversion technologies involve the use of chemical agents to convert biomass into liquid fuels. Biochemical conversion technologies use enzymes of bacteria or other microorganisms to break down biomass.
  4. Answer: False. Nearly all U.S. ethanol production utilizes corn grain in fermentation processes (first generation biofuels, which are derived from sugars or starches). Most research is aimed at identifying cost effective and sustainable means to convert cellulosic plant material into biofuels.
  5. Answer: E. All mentioned factors contribute toward efforts to develop bioenergy resources and technologies.
  6. Answer: E. policy initiatives can provide incentives to entrepreneurs that spark development of a new industry.