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Abiotic Factors Affecting Organisms - revision notes

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ABIOTIC FACTORS = non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems. Factor How its measured Units of measure Light Light intensity can be measured both physically measured for example with a LICOR light meter or a QSL (quantum scalar irradiance) meter. Luminous intensity can be measured subjectively measured with eg. a foot-candle meter, a type of photographic exposure meter. Intensity-watts rn-2 or einsteins m-2sec-1 Luminosity Units include candles, lumens, footcandles and lux. Temperature Temperature is measured using a thermometer. It's also a measure of how fast the atoms and molecules of a substance are moving. The units of measure are degrees on the Fahrenheit, Celsius, and Kelvin scales. Humidity Hygrometers may be designed for indoor or outdoor use (or both). ...read more.


Knot Factor? Light Light is important to both animals and plants as it is the main source of living organisms energy on earth. It takes part in photosynthesis which provides energy to both animals and plants, required for growth, movement and survival. Plants need to grow to be used as a food source for animals. Light is also important for animals vision, without light we would not be able to see which would hamper movement and many senses. Humans also required sunlight for vitamin D. Light is also needed for warmth. Factor? Temperature Temperature is a major determining factor of global climate patterns. It affects the life cycles of plants and animals, influences weather and tides, and controls the freeze and thaw of the polar ice caps. A small change in average temperature can have powerful effects on the environment worldwide and can determine if a certain species has a suitable habitat for survival. ...read more.


Factor? O2 Concentration plant cells need oxygen to live, because without oxygen they can't perform aerobic respiration to produce co2 (respiration is the process of breaking down food to get energy). Similarly animals need o2 to respire and live, breath and produce energy. O2 concentration also effects habitats as different species require different levels of o2. Factor? CO2 Concentration Without CO2 the life of photosynthetic organisms and animals would be impossible, given that CO2 provides the basis for the synthesis of organic compounds that provide nutrients for plants and animals. We also know CO2 is toxic to humans therefore affects their health. However plants need co2 for energy. Factor-Wind Wind effects seed dispersal and aids the production of pollen needed for pollination which is important because it leads to the production of fruits we can eat, and seeds that will create more plants. Wind also effects the moisture surrounding guard cells and the gas and water exchange in plants and animals. ...read more.

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