What results do scientists expect from genetically modified prokaryotes, plants and animals?

The creation of genetically modified plants is most often performed to solve the following specific tasks:
1) In order to increase productivity by increasing:
a) resistance to pathogens;
b) resistance to herbicides;
c) resistance to adverse temperatures, poor soil quality;
d) improving the characteristics of productivity (taste and nutritional qualities, optimal metabolism).
2) For pharmacological purposes:
a) obtaining producers of therapeutic agents;
b) producers of antigens, providing food “passive” immunization.