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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 is most important in determining the oxygen concentration for organisms living in soil?
Which abiotic factor would you record to study microclimate differences between shaded and exposed sites in a forest?
Which abiotic factor most directly affects the rate of photosynthesis in plants?
Which abiotic factor can be increased by deforestation and lead to higher local temperatures?
In a river, turbidity is an abiotic factor. What does high turbidity indicate?
Which abiotic factor describes the amount of water held in soil that plants can use?
When investigating effects of temperature on an ectotherm’s activity, which abiotic factor must be controlled to make the experiment valid?
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?
Which abiotic factor is the main cause of increased evaporation and faster transpiration from leaves?
In aquatic ecosystems, which abiotic factor most directly limits the distribution of many fish species?
Which abiotic factor would most likely be the limiting factor for a plant growth experiment performed inside a sealed jar?