The process of sucking of fluid from the cell surface is called as

It acts as a molecular sieve,controlling the passage of large molecules.

Explain: On what basis are substances transported by the plasma membrane/cell membrane?

Proteins associated with the surface of the cell membrane are known as:

Monovalent ions (e.g.,$Na^+, K^+$) $A$ the membrane permeability,while divalent ions $B$ the same. Complete the given statement by filling in the appropriate option for ($A$ and $B$).

The plasma membrane helps in: