What is the role of bacteria in biogas production?

Find the odd one out and give the reason in support of your answer.

Formation of curd, Leather industry, Mushroom cultivation.

 Give one example of each of the following. 

 Bacteria that convert milk into curd.

Give one example each of the following:

A bacterium which converts milk into curd. (Write the complete scientific name of the organism)

Find the odd one out and give the reason in support of your answer.

Baking bread, Mycorrhiza, Formation of curd.