seedless fruits can be obtained by?

Answer 1

Seedless fruits can be obtained by inducing polyploid plants and breeding infertile hybrids from plants with different ploidy numbers.
Plants can be induced to go from diploid to tetraploid. Unlike animals plants can carry their chromosomes in multiples greater than 2. Two sets of genes multiplies to four sets. This occurred spontaneously throughout history but now it can be chemically induced in order to create seedless offspring. If you cross a diploid plant with a tetraploid plant you get an infertile hybrid with the odd number of three chromosomes. The chromosomal cannot align in pairs during meiosis but the normal sequence is unimpaired for mitosis so the fruit can grow normally it just cannot produce the next generation of seeds.
Since the triploid plants can’t produce the next generation themselves they are pollinated by diploid father plants. The act of pollination triggers the fruit to grow without a fertile egg present. This means seedless plants all carry small undeveloped seeds. Bananas have black specks in the flesh that are immature seeds and watermelon have soft, shriveled, white discs.
William Thompson introduced the seedless grape we still call the Thompson grape. It came to be by some natural process, it was a mutant diploid seedless grape growing wild that he discovered and propagated by grafting branches onto rootstocks. Thompson continued grafting until he developed the line that we still use. The same is true of seedless oranges. They are also all grafted descendants from one wild, seedless plant discovered by someone able to graft and perpetuate the original orange tree.
So all seedless plants are dependent on humans for propagation by some means alternate to sexual reproduction. It's just that we no longer have to discover the first parent any more we can induce the seedless parent stock in a lab.
http://www.ccmr.cornell.edu/education/ask/index.html?quid=651
http://www.madehow.com/Volume-6/Seedless-Fruits-and-Vegetables.html

Answer 2

taking out the seeds..

or its a genetical seedless

Answer 3

taking the seeds out

Answer 4

vegetative propagation,i.e. cuttings,etc.