Question 1

Infographic 32.5

-Use Infographic 32.5 to describe the production of grain ethanol and cellulosic ethanol. Why is it more challenging to produce ethanol from plants with high cellulose content compared with producing it from grain?

Accepted Answer

The answer of  Infographic 32.5

-Use Infographic 32.5 to...

Question 2

Which trade-offs of traditional biofuels, like ethanol produced from corn, can be addressed by using algae as a biofuel source?

Accepted Answer

A)  using large amounts of fresh water to grow and process the source 
B)  overharvesting of a biofuel source that negatively affects the local ecosystem 
C)  using farmland for biofuel source production 
D)  A, B, and C 
E)  none of these answers

Question 3

Although it is clear that alternative energy sources such as bioethanol and biodiesel are reducing fossil fuel usage, ___________ is also a key strategy to reducing our dependence on fossil fuels.

Accepted Answer

A)  desalination 
B)  development of vertical farming 
C)  conservation 
D)  space exploration 
E)  none of these answers

Question 4

Which of the following is a challenge faced when making biofuel from algae?

Accepted Answer

A)  meeting fresh water requirements 
B)  competition with food crops 
C)  the high expense of oil production facilities 
D)  convincing companies to invest in turning algae oil into fuel 
E)  A and C

Question 5

_____________ is a term used to explain a biofuel disadvantage that reduces the contributions made from forests and grasslands to ecosystem services.

Accepted Answer

A)  Overhauling 
B)  Overharvesting 
C)  Hyper-producing 
D)  Overgrowing 
E)  None of these answers

Question 6

One way to improve energy return and reduce the amount of greenhouse gases typically released by traditional monoculture fuel crops is to use LIHD grassland plants. What does LIHD stand for?

Accepted Answer

A)  low-input, high-density 
B)  low-input, high-diversity 
C)  lean-inflow, high-density 
D)  lean-inflow, high-diversity 
E)  late-ingrass, high-dependence

Question 7

Which of the following is NOT an advantage of using biofuels as an alternative energy source?

Accepted Answer

A)  Biofuels can be replaced over short time scales. 
B)  Biofuels enable us to turn waste into energy. 
C)  Crops for biofuels can be grown on marginal land. 
D)  Biofuels are versatile; they can be used in a variety of ways. 
E)  None of these answers-all are advantages.

Question 8

What are biofuels, and what are potential biofuel sources?

Accepted Answer

The answer of What are biofuels, and what are potential...

Question 9

Infographic 32.3.

-Refer to Infographic 32.3. Use the data from the energy return on energy investment comparison graph to determine which crop offers the highest net energy return (output - input).

Accepted Answer

A)  corn grain ethanol 
B)  soybean biodiesel 
C)  biomass combustion 
D)  biomass ethanol 
E)  biomass biodiesel

Question 10

Which of the following is(are) predicted to generate the most oil per acre in biodiesel production?

Accepted Answer

A)  algae 
B)  switchgrass 
C)  soybeans 
D)  rapeseed 
E)  oil palms

Question 11

Which of the following is the best option in terms of being environmentally friendly?

Accepted Answer

A)  avoiding quick starts and speeding up to stop signs 
B)  removing golf clubs from the trunk unless going to the golf course 
C)  combining errands into one trip that minimizes driving miles 
D)  investing in a hybrid or all-electric car 
E)  biking or walking to work, to school, or to run errands

Question 12

Infographic 32.3.

-Refer to Infographic 32.3. Use the data from the reduction of greenhouse gas emissions by biofuels graph to describe how emissions from biofuels compare with that of gasoline. Also, how do emissions compare between current biofuels and LIHD biofuels?

Accepted Answer

The answer of  Infographic 32.3.

-Refer to Infographic 32.3. Use...

Question 13

Which of the following is NOT a benefit of switching from corn ethanol to cellulosic ethanol?

Accepted Answer

A)  the potential to circumvent the food controversy by not occupying land that could support food crops 
B)  the resistance to many pests and plant diseases 
C)  the requirement of less fertilizer 
D)  the consumption of less energy for production 
E)  the ease of scaling up production

Question 14

Explain the outcome of David Tilman's research and what it meant for biofuel crops.

Accepted Answer

The answer of Explain the outcome of David Tilman's research...

Question 15

Which of the following is a beneficial characteristic of using crops such as switchgrass to produce cellulosic ethanol?

Accepted Answer

A)  It makes use of exhausted farmland. 
B)  It does not displace food production. 
C)  Production consumes less energy. 
D)  It is a perennial. 
E)  All of these answers are correct.

Question 16

Driving habits that maximize mileage include all of the following EXCEPT:

Accepted Answer

A)  keeping your vehicle in tune by scheduling regular maintenance appointments. 
B)  avoiding idling and turning off your car if you will be parked, even briefly. 
C)  maintaining 70 miles per hour on the highway to decrease the time the engine is running. 
D)  avoiding carrying excess weight in the vehicle. 
E)  None of these answers are correct.

Question 17

Cellulose is complex and difficult to break down. Which of the following is NOT a method currently being used to tear apart the strong chemical bonds in cellulose?

Accepted Answer

A)  low temperatures 
B)  high temperatures 
C)  acid 
D)  enzymes 
E)  yeast

Question 18

Choose the form of biomass that is easiest to ferment into bioethanol.

Accepted Answer

A)  switchgrass 
B)  crop waste 
C)  corn 
D)  forestry waste 
E)  manure

Question 19

Which form(s) of biomass is(are) burned directly for energy?

Accepted Answer

A)  dried manure 
B)  restaurant fry grease 
C)  firewood 
D)  A and C 
E)  B and C

Question 20

Which of the following is CORRECT regarding indirect biomass energy?

Accepted Answer

A)  It is converted from biomass and then burned. 
B)  This energy-rich fuel is less bulky than the original biomass. 
C)  These fuels burn more cleanly than the original biomass. 
D)  These fuels can power engines that currently run on gasoline or diesel fuel. 
E)  All of these answers are correct regarding indirect biomass energy.

Exam 32: Restoring the Range: the Key to Recovering the Worlds Grasslands May Be a Surprising One

Infographic 32.5 -Use Infographic 32.5 to describe the production of grain ethanol and cellulosic ethanol. Why is it more challenging to produce ethanol from plants with high cellulose content compared with producing it from grain?