$LAB$ (Lactic Acid Bacteria) are used to curdle milk by producing:

During the production of bread,the release of $CO_2$ is caused by the action of:

The main ingredient of South Indian dishes like idli and dosa is

Which of the following is produced by the process of fermentation by microbes?

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 organisms are responsible for the conversion of milk into curd?