LIFE SCIENCE

Detailed explanation-1: -Which of these three liquids has the highest water potential? Pure water has the highest water potential. Dissolved solutes reduce the water potential, so the water potential of 10% sucrose is between that of water and 20% sucrose. Which process is responsible for gas exchange in the lungs?

Detailed explanation-2: -Pure water has the highest concentration of water molecules. Therefore, it has the highest water potential.

Detailed explanation-3: -The largest water potential any volume of water can have, if only standard atmospheric pressure is being applied to that volume of water, is defined as 0. This is the water potential for distilled water. Distilled water has the greatest potential to move, and thus displace another object.

Detailed explanation-4: -Note: If some solute is dissolved in pure water, the solution has fewer free water, and the concentration of water decreases, reducing its water potential. Hence, all solutions have lower water potential than pure water, the magnitude of its lowering due to dissolution of salt is called solute potential.

Detailed explanation-5: -By convention, the water potential of pure water is assumed to be zero, in order that the water potential of all solutions is negative. The osmotic potential is the potential due to dissolved solutes. More the number of dissolved solute particles, the more the osmotic potential.