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Abiotic Factors (GCSE Biology)

The following is a GCSE Biology test covering 'Abiotic Factors' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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Which abiotic factor would you record to study microclimate differences between shaded and exposed sites in a forest?
Which abiotic factor most directly changes the oxygen-carrying capacity of water for aquatic organisms at higher altitudes?
In aquatic ecosystems, which abiotic factor most directly limits the distribution of many fish species?
Which abiotic factor would you record to assess oxygen availability for organisms living under ice in winter?
Which abiotic factor would ecologists measure to estimate potential for soil compaction and root penetration?
Which abiotic factor describes the amount of water held in soil that plants can use?
Which abiotic factor is measured in lux and commonly used in plant-growth experiments?
In an experiment on aquatic plants, which abiotic factor would you change to investigate its effect on gas bubble production as a measure of photosynthesis?
When investigating effects of temperature on an ectotherm’s activity, which abiotic factor must be controlled to make the experiment valid?
Which abiotic factor commonly causes stratification in lakes, producing layers of different temperatures?
Which abiotic factor most directly affects the rate of photosynthesis in plants?