Question

If red blood cells are placed in distilled water, they will

• A. Shrink and collapse
• B. First increase in volume and then burst
• C. Stick together
• D. None of the above

Answer 1

The correct option is B First increase in volume and then burst

In distilled water, the concentration of water is higher outside the RBC than on the inside, as RBC contains salts and proteins. As there is difference in the osmotic pressure, the distilled water will flow into the RBC, thereby increasing its size or swell and eventually, causing it to lyse.
Thus, the correct answer is option B.