Dosa, Dhokla and Idli are the fermented preparations of rice and black Gram with ________ species of bacteria.

Step-by-step solution

Dosa, Dhokla, and Idli are traditional Indian foods prepared by the fermentation of a mixture of rice and black gram. The fermentation process is primarily carried out by lactic acid bacteria, specifically Leuconostoc and Streptococcus species. These bacteria produce lactic acid and carbon dioxide, which gives the batter its characteristic sour taste and makes it puffy. Answer: Leuconostoc and Streptococcus