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Phloem transport is bidirectional while xylem transport is unidirectional. Give a reason?

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Phloem transport is bidirectional because prepared food materials translocated to storage regions. These storage food materials are again transported to growing regions for the growth of buds. So, through phloem downward and upward transport takes place. Xylem transport is unidirectional because water and minerals are absorbed and conducted upwards.

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