Re: How do seedless oranges reproduce?

Many plants including oranges and grapes can be reproduced by grafting. A 
young shoot of the plant is cut off and placed in the cut stem of a growing 
similar plant and this is bandaged. The two plants grow together [if they 
are compatible] and the shoot grows to form a 'new plant'.
It is also possible with some plants to grow cells of the plant on special 
media that supply all the nutrients and hormones necessary to grow clusters 
of cells into new plants with their own shoots and roots. Once these plants 
are growing well, they can produce fruit even though the fruit doesn't 
contain seeds.