Plzz answer Q4.

a) A= CELL WALL
    B =CELL MEMBRANE
    C=CYTOPLASM
    D=NUCLEUS.

b) 

The root hair cell is turgid because of the endosmosis of water from its surrounding soil.

Endosmosis is the inward diffusion of water through a semi-permeable membrane when the surrounding solution is less concentrated. This leads to the swelling up of the cells and thus becomes turgid.
c)

d) 

 When a concentrated solution of fertilizer is added near the root hair cell it undergoes exosmosis and thus gets plasmolysed.


regards