ROOT

CHARACTERISTICS

—Located underground
—Shows positive geotropism
—Shows negative phototropism—Non-green, usually brown
— Branched or unbranched—Do not have buds
—Do not have nodes and internodes

FUNCTIONS

•Absorption of water and minerals
•Anchorage (support from the base)

TYPES

TYPE 1.-TAPROOT

When radicle germinated to form primary roots that are branched further into secondary and tertiary roots. E.g.- Dicot plants  

TYPE 2.-FIBROUS ROOT

When radicle germinated to form much fiber like roots. E.g.- Monocot plants

TYPE 3.-ADVENTITIOUS ROOT

These roots arise from other parts of the plant rather than radicle. E.g.- prop roots in the Banyan tree 

MODIFICATIONS

1.Storage root: They have reserve food

 Conical- e.g.- carrot                         











     Fusiform-e.g.- radish

                                










  Napiform-

 e.g.- turnip, beat root        






  Irregular-e.g.- sweet potato

 

                                

  

 

2. Prop roots:

 e.g.- banyan tree
 - They provide mechanical support
 - Helps in the expansion of canopy

 

 

3. Stilt roots: 

e.g.- sugarcane

- Stilt roots provide support from the base

 

 4. Pneumatophores:

 e.g.- mangrove trees
- These roots help in gaseous exchange