(a) Certain specific bacterial spores are mixed in water and sprayed over Brassica crop to control butterfly catterpillars. Name this bacterium and its mode of action on the butterfly catterpillars.
OR
(b) Immunotherapy these days is one of the most efficient way of treatment of cancer. The therapy involved activates the immune system and destroys the tumour. Primordial follicles/ovary (i) Write an example of one such biological response modifier used in immunotherapy. (ii) Why do patients need such substances if immune system is already working in body? (iii) State what is 'Contact inhibition'.
