Describe three specific examples and techniques used to genetically modify plants?

Answer 1

One could modify the starch production in sugar beets by transforming the plant cells with microprojectile bombardment with vectors containing starch biosynthesis genes, culturing the transformed cells into callus tissue and then transferring to growth media and growing the plant to produce a different type of starch

One could produce a vaccine in a plant by putting a polypeptide encoding sequence in a viral vector, infecting a plant and harvesting the infected leaves for the protein produced in them and using it as vaccine.

One could give a plant insect resistance by inserting a BT gene into a plasmid, transform agrobacterium and then infect the plant with agrobacterium so that the plant takes up the BT gene and is then resistant to insects.

Answer 2

Selective breeding would be one way