Name the bacterium, from which 'Bt' toxin is produced.

One word Name the bacterium by which leprosy is caused.

Name the factors on which the deviation produced in the path of a ray oflight by a prism depends.

Name the tissue in which matrix is not produced by the cells it contains.

What is the basic principle of vaccination? How do vaccines prevent microbial infections? Name the organism from which hepatitis B vaccine is produced.

Name a bacterium which yields insecticide.