What are the types and functions of aquaporins?

Which of the following is correct about symplast?

The term $apoplast$ signifies

Adhesion is caused by

Which of the following statements are true for diffusion?
$I-$ It is a short-distance or passive transport.
$II -$ It can occur in any direction from the intercellular space of leaves to the external environment.
$III -$ Energy is expended.
$IV -$ Molecules move from a region of lower concentration to a region of higher concentration.
$V -$ Diffusion is a slow process and is not dependent on a living system.
$VI -$ Diffusion is obvious in gases and liquids,but diffusion in solids is more likely rather than of solids.

The uniformly sweet taste of coffee or tea is due to