Dough kept overnight in warm weather becomes soft and spongy because of

Which role is played by Lactobacillus in our stomach?

Toddy is
$I.$ $A$ traditional drink of Southern India
$II.$ Made by fermentation of sap from palm trees
Which of the statements given above about toddy is/are correct?

Choose the correct sentences.
$(i)$ Dosa and Idli are fermented by bacteria, not yeast.
$(ii)$ $Saccharomyces \text{ } cerevisiae$ is a yeast.
$(iii)$ $LAB$ (Lactic Acid Bacteria) increase the nutritional quality of milk by increasing vitamin $B_{12}$.
$(iv)$ Whisky and brandy are fermented beverages produced by distillation.

Statement $X$: $LAB$ (Lactic Acid Bacteria) is very useful for the digestive system.
Statement $Y$: $LAB$ protects us from harmful bacteria in the stomach.

The dough used for making dosa and idli is fermented by ......... and it appears puffed up due to the production of ......... in it.