Question

What modification is done on Ti plasmid of Agrobacterium tumefaciens to convert it into a cloning ve

Answer 1

Tumour inducing (Ti) plasmid of Agrobacterium tumifaciens is modified into a cloning vector by removing/altering the gene responsible for its pathogenic property.
This is so, that it does not cause harm but can act as a delivery system for the genes of interest into a variety of plants.

Answer 2

.....tumefaciens to convert into a cloning vector by remaining altering the gene responsible for its pathogenic property .....