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Question

The transport of molecules across the cell membrane without the expenditure of energy is an example of

A
active transport
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B
absorption
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C
passive transport
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D
secretion
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Solution

The correct option is C passive transport
When molecules are transported along the concentration gradient i.e., from higher to lower concentration, there is no utilization of energy. This is called passive transport.

Active transport involves the expenditure of energy in the form of ATP (adenosine triphosphate) as the movement of molecules is against the concentration gradient i.e., from low to high concentration.

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