you dont
A tree...
It is grown from cuttings from the host orange tree .
No nothing will happen.
because grapefruits are actually hibrids from an orange tree so the orange could also get polinated from a grapefruit tree
On a tree in a warm climate.
No.
They have evergreen leaves
yes it can (kariya)
On a tree and in an orchard. Every spring the orange tree has blossoms that grow into oranges. They are babied by the grower and then picked by hand.
one seed, equals one plant and a tree upon maturity
yes you can.