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A process that moves molecules from a region where they are scarce to a region where they are already abundant, using cellular energy, is best described as which type of transport?
AActive transport
BSimple diffusion
COsmotic flow
DPassive imbibition
Answer & Solution
Correct answer: A. Active transport
1. Moving against the concentration gradient (low to high) cannot happen on its own.
2. Such uphill movement needs energy supplied by the cell.
3. The transport that spends energy to pump molecules uphill is active transport.
4. So the answer is option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Active Transport", p.208_
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