Topic 7 - Ecology

Question 1

Decomposition is carried out by

Answer 1

Decomposition is carried out by two groups of organisms: detritus feeders (detritivores), and decomposers.
Detritivores such as - small animals like worms and woodlice that feed on dead organic matter.
Decomposers - microorganisms, such as bacteria and fungi.

Question 2

Biogas generators

Answer 2

Biogas generators are large containers in which animal or plant waste is left to decay anaerobically. Importantly, there cannot be any oxygen in the container. If there is oxygen, the microorganisms will respire aerobically and won’t produce as much methane.
Once the biogas is removed from the tank, a sludgy material is left over, which contains a high density of useful minerals. This can be spread on fields like fertiliser.