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| Introduction |
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| Environment includes all the factors that affect the form and growth of the organism. These factors are of two kinds, |
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 Abiotic |
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 Biotic |
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| These are physical factors and fall into three categories |
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 Climatic |
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| This factor includes rainfall, temperature, light, wind and humidity. |
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 Edaphic |
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| This factor includes physical and chemical properties of the soil, its water and air contents. |
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 Topographic |
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| This factor includes undulation, altitude, slope, sunlight, rain and wind. |
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| This factor includes bacteria, protozoa, earthworms in the soil and other living plants and animals including human beings which directly or indirectly effects life forms on the earth. |
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