why roots of plants are mostly confined to the topsoil and donot grow in sub soil?
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A region is arid when it is characterized by a severe lack of available water. Water present on surface or near surface gets evaporated due to intense heat. Plants found in such areas have got modified roots that reaches deep underground water, that has not been evaporated due to surface heat.
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The top layer is topsoil (tricky name, I know) and under that is subsoil. Topsoil is the best soil and is what plants grow in. Subsoil isn't nearly as good for growing plants. ... Thus the soil at the surface of your yard and garden is just as likely to be subsoil as it is to be topsoil.
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