Answer:
Red blood cells placed in a solution with the same water concentration as their cytoplasm (0.85 per cent salt solution) will not experience an overall change in volume. No osmosis occurs.
Blood cells surrounded by dilute solution are hypotonic. The cells swell then burst.
Red blood cells placed in a solution with a higher water concentration compared to their contents (eg pure water) will gain water by osmosis, swell up and burst.
Water will diffuse from a higher water concentration outside the cell to a lower water concentration inside the cell.
Step-by-step explanation: