Which microbes are responsible for making curd from milk?

Toddy,a traditional drink,is made by fermentation from:

Which organism is used for making bread?

$A$: Cheese is one of the oldest food items in which microbes are used.
$R$: Different varieties of cheese are known by their characteristic texture,flavour,and taste.

The dough used for making dosa and idli is fermented by which organisms,and what causes it to appear puffed up?

The bacteria that increase the nutritional quality of milk by increasing vitamin $B_{12}$ are known as .......... .