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  4. Active transport is characterised by

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Q. Active transport is characterised by

AMUAMU 2010Transport in Plants

Solution:

Active transport is uphill movement of materials across the membrane where the solute particles move against their chemical concentration or electro-chemical gradient. Energy is required for the process. It is obtained from ATP. Active transport occurs in case of both ions and non-electrolytes. It requires special membrane proteins which function as pumps for the transport of substances.