Question

Movement of cell against concentration gradient is called
1. Osmosis
2. Active transport
3. Diffusion
4. Passive transport

Answer 1

Correct Answer - Option 2 : Active transport

The correct answer is Active transport​.

• Active transport is the movement of molecules across a cell membrane from a lower concentration to a region of higher concentration against the concentration gradient.

• Osmosis is the movement of a solvent across a membrane (semipermeable)  toward a higher concentration of solute.
  • The solvent is typically water in biological systems, but osmosis can occur in other supercritical liquids, liquids, and even gases.
  • Osmotic pressure is the external pressure required to be applied so that there is no net movement of a solvent across the membrane.
  • The (Osmotic) pressure is a colligative property.
• Diffusion is the net movement of anything from a higher concentration to a region of lower concentration. For example movement of ions, molecules, energy, atoms.
• Passive transport does not require energy to move substances across cell membranes.