Question

in the blood and distilled water solution, why did blood become clear?
a. because distilled water is hypotonic, the cells burst and no longer block light passing through the fluid.
b. because distilled water is hypertonic and the cells shrunk up a little, became smaller, and bent light, it was possible to see through the fluid.
c. because the cells swelled up a little and bent light, it was possible to see through the fluid.
d. because the cells were more dissolved in that type of solution.
what has happened to the cells placed into various solutions?
a. the cells exchanged water with the solutions based on tonicity because the cells have selectively permeable membranes.
b. the cells exchanged solutes with the solutions based on tonicity because the cells have selectively permeable membranes.

Explanation:

For the first question, distilled water is hypotonic compared to blood - cells. Water moves into the cells by osmosis, causing them to burst (hemolysis), and since they no longer block light, the blood becomes clear. For the second question, cells have selectively permeable membranes and exchange water with solutions based on tonicity differences. Water moves from areas of lower solute concentration to higher solute concentration across the membrane.

Answer:

First question: A. Because distilled water is hypotonic, the cells burst and no longer block light passing through the fluid.
Second question: A. The cells exchanged water with the solutions based on tonicity because the cells have selectively permeable membranes.