Answers to Amali Proses Sains Pg 18-19

Aim : To study the effects of hypotonic, hypertonic and isotonic solutions to animal cells

Discussion:

1a) 0.17 M sodium chloride solution

b) Distilled water

c) 0.51M sodium chloride solution

2. Haemolysis

3. Distilled water is hypotonic to the protoplasm of the red blood cells. Water molecules move into the cytoplasm of the red blood cells by osmosis causing the cells to swell and burst. This is known as haemolysis.

4. 0.51M sodium chloride solution is hypertonic to the protoplasm of the red blood cells. Water molecules move out from the cytoplasm of the red blood cells by osmosis causing the cells to shrink. This is known as crenation.

Conclusion

Red blood cells in hypotonic solution will swell and burst. This phenomenon is known as haemolysis. In hypertonic solution, the red blood cells will shrink and is known as crenation. There is no change in shape and size of red blood cells in an isotonic solution.