Water potential $\psi$ is measured in bar or in:

What are the water potential and osmotic pressure of pure water?

Choose the correct option:
$(1)$ The value of ${\psi _S}$ is always negative / positive.
$(2)$ Porins are a type of carbohydrates / proteins.

How many of the following statements are correct?
$I -$ Water molecules possess kinetic energy.
$II -$ In liquid and gaseous forms,water molecules are in random motion.
$III -$ In liquid and gaseous forms,the motion of water molecules is slow and constant.
$IV -$ If a system has a higher quantity of water,its water potential is higher.
$V -$ Pure water has the lowest water potential.
$VI -$ Water always moves from a region of higher water potential to a region of lower water potential.

Which of the following is the unit of measurement of water potential?

Sugar crystals do not dissolve easily in ice-cold water. Explain.