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Biology

GCSE · AQA

QuestionsFlashcards

Communicable Diseases
Monoclonal Antibodies
- Producing Monoclonal Antibodies
  6
- Uses of Monoclonal Antibodies
  7
Plant Disease
- Detection and Identification of Plant Diseases
  6
- Plant Defence Responses
  6

Decomposition Flashcards

All 6 cards in this deck

Name two types of microorganism that cause decay.: Bacteria and fungi.
Which three conditions affect the rate of decay of biological material?: Temperature, water (moisture) and availability of oxygen.
How does increasing temperature affect the rate of decay?: Decay speeds up as microorganisms reproduce faster and their enzymes are more active, until the temperature is high enough to denature the enzymes and decay slows.
Why does a good supply of oxygen increase the rate of decay?: Decomposers need oxygen for aerobic respiration, which releases the energy for growth and reproduction.
Which gas is produced by anaerobic decay, and how is it used?: Methane; biogas generators use anaerobic decay of waste to produce methane as a fuel.
Which conditions do gardeners provide in a compost heap for rapid decay?: Warmth, moisture and oxygen (by turning the heap); the compost is used as a natural fertiliser.