Movement of particles of matter in the cell due to its own kinetic energy is called

Select the correct statement$(s)$ regarding bulk flow.
$I-$ In tall plants,water,minerals,and food are moved by a bulk flow system.
$II-$ This type of movement is achieved through a pressure difference between two points.
$III-$ In bulk flow,substances,whether in solution or suspension,move at the same pace as in a flowing river.
$IV-$ This process is similar to diffusion.

At what temperature is the density of water the highest (in $^\circ \text{C}$)?

Which is an important property of water?

Definitions / Explanation :
$(1)$ Cohesion force
$(2)$ Adhesion force

Cell walls of root hairs for absorbing water must be