The movement of molecules from a region of higher concentration to one of lower concentration is
Explanation
Answer: A. Diffusion
Diffusion is the movement of molecules (like gases or solutes) from a region of higher concentration to a region of lower concentration, until equilibrium is reached. It occurs without a membrane.
Other Options:
B. Transpiration – Loss of water vapor from plant leaves.
C. Osmosis – Movement of water molecules through a semi-permeable membrane from high to low water potential.
D. Translocation – Movement of food (sugars) through the phloem in plants.
E. Plasmolysis – Shrinking of the cell membrane from the cell wall due to water loss in a hypertonic solution.
