The roots that originate from the base of the stem are:

(1) Primary roots

(2) Prop roots

(3) Lateral roots

(4) Fibrous roots

Root hairs develop from the region of:

1. Elongation

2. Root cap

3. Meristematic activity

4. Maturation

In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order :-
1. Root cap, cell division, cell maturation, cell enlargement
2. Cell division, cell enlargement, cell maturation, root cap
3. Cell division , cell maturation, cell enlargement, root cap
4. Root cap, cell division, cell enlargement, cell maturation 

Pneumatophores are found in :
1. The vegetation which is found in marshy and saline lake
2. The vegetation which found in saline soil
3. Xerophytes
4. Epiphytes