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Biology Easy FPSC PPSC NTS Uploaded: 14 Jul 2026

What is the term for the movement of substances from high concentration to low concentration without energy?

  • A Active transport
  • B Osmosis
  • C Endocytosis
  • D Diffusion
Correct Answer: Option D — Diffusion
Explanation:
Diffusion is the passive movement of particles from a region of high concentration to low concentration down a concentration gradient without requiring cellular energy.
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