This is a picture of dry yeast that you can buy from the grocery store. For which of the following dishes would you use yeast?
The fungus yeast is used to prepare bread. A batter of white flour or wheat flour is fermented using yeast. Pizza bread is also made using yeast like normal bread. The fluffiness of bread is due to the production of carbon dioxide by the yeast.
Idli and vada are also prepared by fermentation. However, in these cases the fermentation occurs due to the action of Lactic acid bacteria (Lactobacillus spp.). This is the same bacterium that turns milk into curd (dahi) (which is used in Dahivada).
It is mentioned that yeast produces carbon dioxide; given this information what type of nutrition do you think yeast has?