Biology Topic Practice

Biogas and Anaerobic Decay

Anaerobic decay occurs when there is a lack of oxygen, producing methane gas that can be used as fuel.

What is the main gas found in biogas?

What is Biogas and Anaerobic Decay?

"Biogas is a mixture of gases, primarily methane and carbon dioxide, produced by the anaerobic digestion of organic matter."

Question 1

What do decomposers do in an ecosystem?

Question 2

Which process removes carbon dioxide from the atmosphere?

Question 3

Which condition would usually speed up decomposition by microorganisms?

Producing Fuel

Occurs in biogas generators or digesters.

Microorganisms break down waste (like manure or crop remains) without oxygen.

Produces methane, which can be burned for heating, cooking, or electricity.

Exam Tip

Biogas is a renewable energy source because it comes from waste that is constantly produced.

Accelerate your revision

Master biogas and anaerobic decay and more with our exam-focused practice app.

Try the App Free
No sign-up required to start