Answer:
1.grafting may increase the productivity of certain horticultural crops because they make it possible to do the following things: Change varieties or cultivars. An older established orchard of fruiting trees may become obsolete as newer varieties or cultivars.
2.(1) The rootstock and scion must be compatible; (2) the vascular cambium of the scion must be placed in intimate contact with that of the rootstock; (3) the grafting operation must be done at the time when the rootstock and scion are in the proper physiological stage; (4) immediately after the grafting operation is completed, all the cut surfaces must be protected from desiccation; and (5) proper care must be given to the grafts for a certain period after grafting.
3.Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site. ... Organisms such as hydra use regenerative cells for reproduction in the process of budding.
