S - type bacteria are

With the reference to the below figure of biogas plant answer the following questions, Which type of bacteria are responsible for the production of biogas?

Which types of bacteria are responsible for production of biogas ?

When living R-type of bacteria were mixed with heat killed S-type, they converted or changed to 'S' type. What is this phenomenon called?

When living R-type of bacteria were mixed with heat killed S-type, they converted orchanged to'S' type. What is this phenomenon called ?

Based on shape, the bacteria are classified into …………. Types.

Which type of bacteria can survive at 0^@c temperature?

Assertion : Bacteriophages are a type of bacteria. Reason : Bacteria are unicellular, eukaryotic organisms.