Explain why the growth of these gm-fruit trees will economically benefit the consumer

The "GM" here refers to "genetically modified" plants - they are modified by food engineers to better suit our wishes.

One benefit of those plants is that those plants would be better for humans: for example they would have sweeter flesh or less seeds (this is something that happened to watermelon through the selection of best watermelons throughout the centuries).

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord.