[单选题]
The diagram shows the setup
gu:b.kvkhmg.c 2 8tm*for an osmosis expe
wv7fq92 415gp1uezrqs7m ubwbf)r d(riment. The potato tissue was placed in a solution of unknown concentr
2gqw)z mbpv(1f51 fueb7q497s rurwd ation for 3 days. After 3 days, the potato had lost mass. Which type of solution was the potato placed in, and what was the effect on the pressure potential?
A. Concentration of solution is Hypertonic;Effect on pressure potential of tissue is Decrease
B. Concentration of solution is Hypotonic;Effect on pressure potential of tissue is Increase
C. Concentration of solution is Hypertonic;Effect on pressure potential of tissue is Increase
D. Concentration of solution is Hypotonic;Effect on pressure potential of tissue is Decrease
参考答案:
A
本题详细解析:
The term hypertonic means that the unknown solution has a higher concentration of solutes than the potato tissue, indicating that the solution has a lower, or more negative, water potential than inside the potato cells. This will cause water to move out of the potato cells via osmosis, decreasing the pressure inside the cells and thereby decreasing the pressure potential. Choice A is correct.
Choices B and D are incorrect as the solution must be hypertonic for water to leave the potato cells and cause the loss in mass. Choice C is incorrect, as when the potato tissue loses mass, the pressure inside the potato cells will decrease, decreasing the pressure potential inside the cells.
