Question

what is root modification

Answer 1

Many plants show root modifications to perform special functions. Tap roots are modified mainly for storage of food. Adventitious roots are modified for storage and many other functions like additional support, nutrition and respiration.
 
Modifications of roots for storage
Tap roots and adventitious roots may be modified to store reserve food material. 
A. Tap root tubers: Based on the shape, they are classified into four groups.

       1) Fusiform tubers
       2) Napiform tubers
       3) Conical tubers
       4) Tuberous roots

B. Adventitious root tubers :They are of five types
      1) Tuberous roots
      2) Fasciculated roots
      3) Moniliform or beaded roots
      4) Nodulose roots
      5) Annulated roots
C. Modifications of adventitious roots for Additional Support
     1) Prop roots
     2) Stilt roots
     3) Climbing roots
     4) Clinging roots
D. Modifications of adventitious roots for vital functions
      1) Assimilatory roots
      2) Sucking Roots or Haustoria
      3) Velamen roots 4) Nodular roots 5) Reproductive roots
      6) Pneumatophores
Hope it helps you....

Answer 2

$your \: answer$

☆■》The roots in some ROOT The roots in some plants change plants change there shape and structure and bdif become mo difie d id for var ious IF functions.
Stem is the aerial part of the plant bd Itb b h l bears ‘in terno branc hes, leaves , flowers and fruit. The stem also bears ‘nodes’ .
Storage –The primary root becomes thick and fleshy due to food storage .EXAMPLE- 1)Radish Beetroot
2)Support –Stilt root of Maize ,Sugarcane Prop root of Banyan tree Carrot. Prop root of Banyan tree .
3) Respiration –They are also called pnematophores help to get oxygen for pnematophores , help to get oxygen for respiration.
☆》These may be of three types (i) Underground modification of stem a. Rhi Rhizome e.g., Ginger ,Turmeric etc., b. Bulb e.g., Onion , Garlic . c. Tuber EXAMPLE Potato.
☆》ii) Sub-aerial modification of stem : ROli Runner e.g., c. Suc Oxa lis b. Offset e.g., Pistia Sk B Pi l ker e.g., Banana , Pineapp (iii) Aerial modification of stem a. b. St Stem Ten Tendrill Example- Thorn C Cucum Watermelon b Thorn e g Citrus Duranta EXAMPLE- d. Citrus , Duranta c. Cladode e.g., Asparagus d Phylloclade e g Opuntia Phylloclade Euphorbia