Organisation of an Ecosystem (AQA GCSE Biology): Flashcards

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Decomposition
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Decomposition definition

Dead materials breaking down and rotting

Organisms that carry out decomposition

Microorganisms

Effect of warmer temperature on decay

Speeds up decay

Why warmth speeds up decay

Makes chemical reactions faster in microorganisms

Effect of moist conditions on decay

Speeds up decomposition

Why microorganisms need water

To survive and carry out life processes

Type of respiration with oxygen

Aerobic respiration

Type of respiration without oxygen

Anaerobic respiration

Gas produced in biogas generators

Methane gas

Conditions in biogas generators

Anaerobic (no oxygen)

Formula for rate of decay

Change in massNumber of days\frac{\text{Change in mass}}{\text{Number of days}}

Three factors affecting decay rate

Temperature, water content, oxygen availability

Conditions causing fastest decay

Damp conditions

Effect of disinfectant on decay

Kills microorganisms, slows decay

Products from biogas generators

Methane gas and fertiliser

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