27. Describe the microbial leaching process for recovering copper from CuS 28. Why some microorganisms are resistant to mercury? 29 Microor ganisms are sometime used for cleaning of env ironmental pollutions, such as petroleum and pesticides? 30. What is lichen and mycorrhiza? 31. How is Ti-p lasmid transfer T-DNA from Agrobacterium to plant genome 32. Why is Root nodule bacteria and symbiosis so important for legumes?27. Describe the microbial leaching process for recovering copper from CuS. 28. Why some microorganisms are resistant to mercury? 29. Microorganisms are sometime used for cleaning of environmental pollutions, such as petroleum and pesticides? 30. What is lichen and mycorrhiza? 31. How is Ti-plasmid transfer T-DNA from Agrobacterium to plant genome? 32. Why is Root nodule bacteria and symbiosis so important for legumes?