Question

how do bacteria and yeast helpful for fermentation of idlis ​

Answer 1

Answer:

Heat allows the growth of bacteria like yeasts which along with free availability of oxygen and sugar decompose into carbon-dioxide and water. ... Black gram supports the growth of yeasts since it is rich in proteins

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Explanation:

Answer 2

Answer: Idli is one of the famous food of India specially in South India. The micro-organism developing during the initial soaking of ingredients are sufficient to carry out fermentation. Both bacteria and yeast play important role in fermentation. Bacteria are responsible for acid and gas production where as yeast is responsible for organoleptic quality.

Explanation:

   The micro-organism developing during the initial soaking of ingredients are sufficient to carry out fermentation.

   Both bacteria and yeast play important role in fermentation.Bacteria are responsible for acid and gas production where as yeast is responsible for  quality .

   Gram dal is effective substrate for maximum number of fermentation organism and it has high number of nutrients that support growth of lactic acid bacteria.

   Bacteria associated are  Lactobacillus coryniformis, Lactobacillus  Lactobacillus fermentum, Lactobacillus lactis.

    Yeast associated with fermentation are Saccharomyces cerevisiae,  candida

   The role of lactic acid bacteria is to reduce pH of batter to level 4.4 to 4.5 and this pH is optimum for yeast activity.

                               Hope this will be helpful :)