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WorksheetsHW 4.6: Biofuels
Total questions: 10
Worksheet time: 5mins
What is the basic definition of a biofuel?
A fuel made from rocks
A fuel made from recently living organisms
A fuel produced only from animals
A fuel formed over millions of years from organic matter
What key feature distinguishes biofuels from fossil fuels?
Biofuels burn at a lower temperature, while fossil fuels burn at a very high temperature
Biofuels are made from non-living materials, while fossil fuels are made from organic matter
Biofuels come from recently living organisms, while fossil fuels come from ancient ones
Fossil fuels contain no carbon, while biofuels are carbon-based
Most biofuels come from plants or algae because they can:
Grow underwater store geo-thermal energy
Produce electricity from sunlight
Photosynthesize and store the sun’s energy
Grow anywhere
Biofuels are often considered carbon neutral because:
They release no CO₂ when burned
They actually absorb carbon which is not released when they are burned
The CO₂ released during burning equals the CO₂ absorbed while growing
Plants store methane instead of CO₂
Which of the following can also be used to make biofuels, though usually on a smaller scale?
Minerals
Animal waste
Plastics
Metals
Which of the following is a benefit of biofuels?
They cannot be regrown
They are extremely expensive to make
They are renewable and relatively cheap
They require special vehicles to use
A major advantage of biofuels in transportation is that:
They increase the efficiency of the engine
Existing cars can use mixtures of biofuels and petrol
They produce less pollution
They work in electric cars
One environmental issue with growing biofuel crops is that it often requires:
Increasing ocean levels, which worsens climate change
Converting natural land such as forests, which released CO₂
Building large dams, which disrupts and harms aquatic species
Digging underground tunnels, which leads to more erosion
Why does producing biofuels still release CO₂?
Plants refuse to absorb carbon
The Sun does not provide enough energy
Harvesting, processing, and transporting biofuels require energy
Biofuels chemically break down into CO₂
According to the video, how should biofuels be used?
Only as the world’s main energy source
Not at all, due to their drawbacks
Only for cars and nothing else
In situations where they make sense, alongside other energy sources
