Which organism produces $CO_2$ that makes bread soft and porous?

How can food products be prepared from fish,soybeans,and bamboo?

What is produced by $LAB$ during the process of curd formation?

Study the following flow chart that shows curd formation from milk and select the correct option for $A$ and $B$.
Milk is incubated with curd
$\downarrow$
$LAB$ shows growth in milk
$\downarrow$
Production of .....$A$.....
$\downarrow$
Coagulation and digestion of milk protein
$\downarrow$
Improved nutritional quality by increased ....$B$....

Which process is responsible for the preparation of dosa and idli batter due to the action of $LAB$?

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