Which plant  develop from buds present in their roots?

Soil is made fertile by adding 

Reproductive organ of a plant

By which method do lotus plants  disperse its seeds?

 In some fields, water is simply released into the field. It is called:

A seed dispersed by water .

New plants grow from  leaves ih

Sweet potato develops from  the part present in the roots

Coconut trees disperse its seeds by:

Crops grown in summer are called: