A student investigated how blood cells respond to two different salt solution concentrations. The student placed each concentration of salt solution onto one of two microscope slides, and then added a small drop of fresh blood to each slide. Both slides were examined with the high-power lens of a microscope, and the student recorded the observations. slide 1: No red blood cells could be seen. slide 2: The red blood cells could be seen but appeared slightly crinkled. Which row gives the correct explanation for the results observed? (key: $\Psi$ = water potential)
- Aslide 1: Swelling of the cells caused them all to burst. slide 2: The $\Psi$ of the cell was more negative than the $\Psi$ of the external solution.
- Bslide 1: The $\Psi$ of the cell was more negative than the $\Psi$ of the external solution. slide 2: The $\Psi$ of the external solution was more negative than the $\Psi$ of the cell.
- Cslide 1: The $\Psi$ of the cell was less negative than the $\Psi$ of the external solution. slide 2: There is a net movement of water out of the cell by osmosis.
- Dslide 1: The $\Psi$ of the external solution was less negative than the $\Psi$ of the cell. slide 2: The $\Psi$ of the cell was very similar to, but slightly more negative than, the $\Psi$ of the external solution.