Write about:(a) Assay for bacterial viruses.(b) Assay for animal viruses. [8+8]6. (a) Discuss different types of solidifying agents and their uses in preparation ofmedia.(b) How a suitable culture media is prepared for culturing the bacteria? [8+8]7. (a) What are primary stock and working cultures?(b) Explain about subculturing. [8+8]8.