Movement of molecules of gases,liquids and solids from a region of higher concentration to a region of lower concentration is termed as

The cell wall is permeable and not a semipermeable structure; this can be best deduced from the passage of water and mineral salts from:

Choose the correct option regarding the transport of water in plants.

Which of the following statements is/are not incorrect?
$(i)$ Water and minerals,and food are generally moved by a mass or bulk flow system.
$(ii)$ Bulk flow can be achieved either through a positive hydrostatic pressure gradient or a negative hydrostatic pressure gradient.
$(iii)$ The bulk movement of substances through the conducting tissues of plants is called translocation.
$(iv)$ Xylem translocates organic and inorganic solutes,mainly from roots to the aerial parts of the plants.
$(v)$ Phloem translocates water,mineral salts,some organic nitrogen and hormones,from the leaves to other parts of the plants.

Select the correct statement.

The following figure shows the pathway of transport in the root. What are $P, Q,$ and $R$?