AP BIOLOGY

Detailed explanation-1: -Water potential () is actually determined by taking into account two factors-osmotic (or solute) potential (S) and pressure potential (P). The formula for calculating water potential is = S + P.

Detailed explanation-2: -Pressure potential is controlled by solute potential (when solute potential decreases, pressure potential increases) and the opening and closing of stomata. Gravity potential (g) removes potential energy from the system because gravity pulls water downwards to the soil, reducing total.

Detailed explanation-3: -A plant cell with a s of-7.5 bars keeps a constant volume when immersed in an open-beaker solution that has a s of-4 bars. What is the cell’s P? The plant cell keeps a constant volume because of the buildup of turgor pressure inside the cell.

Detailed explanation-4: -Divide the depth in meters measured in Step 1 by 10 and add one to the result to calculate the amount of atmospheres of pressure present at the depth. Multiply your result from Step 2 by the difference in depth measured in Step 1 to get the pressure potential per unit volume of the water at the depth you are measuring.