Please do this... the last words in the 5th one are microorganisms *desirable* or undesirable?

Dear student,
Please find below the answer:

1. Microbiology
2. False. Some fungi are multicellular like bread mold.
3. Cyst
4. In water
5. The decomposition of dead plants and animals by microorganisms is desirable as it helps in recycling nutrients.
6. Dengue
7. Virus
8. Pasteurization

Hope this clears your doubt.
Regards.