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The movement of ions against the concentration gradient will be :
A
Active transport
B
Osmosis
C
Diffusion
D
All
Detailed Solution
Movement of substances from a region of lower concentration to higher concentration (against the gradient) needs energy (ATP) and carrier proteins (pumps). This is active transport, e.g. the $Na^+/K^+$ pump.
Diffusion and osmosis are passive processes that occur along the concentration gradient.
So movement of ions against the concentration gradient is active transport.
Diffusion and osmosis are passive processes that occur along the concentration gradient.
So movement of ions against the concentration gradient is active transport.