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B7 ECOLOGY

ABIOTIC AND BIOTIC FACTORS

QuestionAnswer
What types of factors can change in the environment in which organisms live? The environment in which organisms live changes all the time. The things that change are either abiotic (non-living) or biotic (living) factors.
What can happen to abiotic factors in an ecosystem? Abiotic factors can vary in an ecosystem.
What types of factors are abiotic factors? Abiotic factors are non-living factors.
Give examples of abiotic factors. 1) Moisture level 2) Light intensity 3) Temperature 4) Carbon dioxide level (for plants) 5) Wind intensity and direction 6) Oxygen level (for aquatic animals) 7) Soil pH and mineral content
What could a change in the environment do to an abiotic factor? A change in the environment could be an increase or decrease in an abiotic factor, e.g. an increase in temperature. These changes can affect the size of populations in a community.
What could decrease the rate of photosynthesis in a plant species be caused by and what would be the effect of this? For example, a decrease in light intensity, temperature or level of carbon dioxide could decrease the rate of photosynthesis in a plant species. This could affect plant growth and cause a decrease in the population size.
What would a decrease in the mineral content of the soil cause? What would this then affect? For example, a decrease in the mineral content of the soil (e.g. a lack of nitrates) could cause nutrient deficiencies . This could also affect plant growth and cause a decrease in the population size.
What types of factors are biotic? Biotic factors are living factors.
GIve examples of biotic factors. 1) New predators arriving 2) Competition-one species may outcompete another so that numbers are too low to breed 3) New pathogens 4) Availability of food
What would be the knock on effect of changes to the size of popluations in a community from changes in abiotic factors? These changes can affect the size of populations in a community. This means they can also affect the population sizes of other organisms that
Created by: HJB1972
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