What must be present for diffusion to occur?

What must be present for diffusion to occur?
  1. A concentration gradient
  2. A protein channel
  3. ATP energy
  4. Solubility in lipids

Solution

Diffusion can only occur if a gradient is present, which means that the concentration of the substance is higher on one side of the membrane than the other.

Asked in: NCERT

Practice more Transport in Plants questions on Aicharya