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Biogas generators can be filled with faeces.

Unit 3 - Biofuels

This GCSE Biology quiz on biofuels explores how fuels from plants and microorganisms are produced, their advantages, and their environmental impact compared with fossil fuels.

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Fascinating Fact:

When biofuels are burned they release carbon dioxide, but growing the plants can remove carbon dioxide from the atmosphere through photosynthesis.

In GCSE Biology, biofuels are studied as renewable energy sources made from plant material or microorganisms. You learn how they are produced, how they compare with fossil fuels, and how their use affects carbon dioxide levels and land use.

Key Terms

Biofuel: A fuel made from recently living material such as plants or waste, for example biodiesel or biogas.
Carbon neutral: A term used when the carbon dioxide released is balanced by the carbon dioxide taken in during growth.
Fermentation: A process in which microorganisms, often yeast or bacteria, break down sugars to produce products such as ethanol or biogas.

Frequently Asked Questions (Click to see answers)

What are biofuels in GCSE Biology?

In GCSE Biology, biofuels are fuels made from biological material such as crops, plant waste, or manure. Examples include biodiesel, bioethanol, and biogas from decomposing organic matter.

What are the main advantages and disadvantages of biofuels?

Biofuels can be renewable and may reduce demand for fossil fuels. However, growing fuel crops can take up land, require fertilisers and water, and may lead to habitat loss or higher food prices.

Are biofuels really carbon neutral?

Biofuels can be closer to carbon neutral because plants absorb carbon dioxide as they grow. In practice, farming, fertilisers, processing, and transport also release carbon dioxide, so the balance is not perfect.

Try These Related Quizzes

1 .

What are biofuels made from?

Coal

Oil

Gas

Animal and plant material

Biofuels come from organisms

2 .

Biogas is primarily made up of which gas?

Methane

Oxygen

Carbon dioxide

Hydrogen

Methane is a useful fuel

3 .

Biogas is made by which process?

Aerobic respiration

Alcoholic fermentation

Anaerobic fermentation

Respiration

Biogas is made by a special type of anaerobic respiration called anaerobic fermentation. This is not the same process which occurs in the muscles of our body

4 .

Biogas generators can be filled with which of the following?

Air

Water

Faeces

Nitrogen

Human and animal faeces can be used as well as food waste. So it helps to keep the environment clean as well as providing a useful fuel

5 .

In a biogas generator, what does the animal or plant material supply?

Carbohydrate (sugar)

Protein

Fat

Water

The carbohydrate is changed into the product methane

6 .

Methane is a greenhouse gas and contributes to...

the weather

global warming

ozone depletion

respiration

Global warming is the gradual increase in the average temperature of the surface of the Earth

7 .

Which of the following is not caused by global warming?

Increased temperature of the Earth

Rise in sea levels

Increased biodiversity

Climate change

Global warming leads to reduced biodiversity

8 .

What is biodiversity?

The number of species

The population of humans

The variety of birds

The number of trees

Biodiversity is important to the health of the planet. It refers not just to the number of different species but also to the genetic variations within each species

9 .

Biogas is produced at a faster rate if the temperature is...

increased

decreased

unchanged

heated for longer

About 35 degrees C is the optimum temperature

10 .

Biogas generators are useful in developing countries such as Africa, because they easily and cheaply get rid of what?

Fuel

Air

Waste

Soil

The raw materials are free and recycled into a useful product, biofuel, which can be used for many purposes

Author: Donna Davidson (GCSE Biology Teacher & Examiner, Quiz Writer)

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