The main characteristics of roots are:
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Roots constitute the non-green descending portion of the plant axis which is positively geotropic or negatively phototropic.
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The roots cannot perform the function of photosynthesis since its lacks chlorophyll.
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It shows lateral unicellular root hairs, which increase the surface area for absorption.
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It shows root apex which is protected by a root cap.
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It does not show nodes, internodes, buds and leaves but shows lateral branches which arise from the pericycle.
