The intake of water into cells is known as:

When a freshly collected $Spirogyra$ filament is kept in a $10\%$ potassium nitrate solution,it is observed that the protoplasm shrinks in size.
$(a)$ What is this phenomenon called?
$(b)$ What will happen if the filament is replaced in distilled water?

$A$ cell increases in volume if the external medium is

Grapes immersed in water would shrink if

$A$ $hypotonic$ solution is defined as . . .

By which process does water move from the adjacent xylem into the phloem?