Aerobic Decomposition and Decay Flashcards

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What is meant by aerobic decomposition (aerobic decay)?

Aerobic decomposition is the breakdown of dead plants and animals by decomposers using oxygen.

Which two main groups of microorganisms carry out most aerobic decomposition?

Bacteria and fungi carry out most aerobic decomposition.

Why is oxygen needed for aerobic decomposition?

Oxygen is needed so decomposers can respire. They use it to release energy from the dead material.

What are the main products of aerobic decomposition?

Aerobic decomposition produces carbon dioxide, water and mineral ions, and releases energy as heat.

How does aerobic decomposition help recycle nutrients in an ecosystem?

It breaks down dead material and returns mineral ions to the soil, where plants can take them up again.

Why do gardeners turn a compost heap regularly?

Turning the heap lets air in, giving decomposers oxygen so aerobic decomposition can continue.

Name three conditions that make aerobic decomposition happen quickly.

Warm temperature, moist conditions and plenty of oxygen make aerobic decomposition happen quickly.

In aerobic decomposition, which gas is mainly released into the air by decomposers?

In aerobic decomposition decomposers release carbon dioxide into the air.

How does aerobic decomposition of dead organisms help the carbon cycle?

Decomposers respire and release carbon dioxide, which can then be used by plants in photosynthesis.

What is the role of detritivores, like earthworms, in aerobic decomposition?

Detritivores break dead material into smaller pieces. This gives bacteria and fungi more surface area to decompose it using oxygen.

Describe the basic steps in aerobic decomposition of a dead leaf.

Detritivores first break the leaf into small pieces. Bacteria and fungi then digest it using oxygen and release carbon dioxide, water and mineral ions.

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