LACTOBACILLUS BULGARICUS is
HETEROTROPHIC.
The term heterotroph comes from the two Greek words "heterone" (another), and "trophe", which means nutrition. Heterotroph essentially represents anything above the producers in the food chain; a consumer. Animals, herbivores, omnivores and carnivores are all heterotrophs, as well as some bacteria (again, including LACTOBACILLUS BULGARICUS.)
Heterotrophs cannot obtain carbon to survive directly from the source (the producers, as seen in the above animation), nor can they obtain energy directly from light, nor can they obtain energy directly from inorganic oxidation.
So, in terms of LACTOBACILLUS BULGARICUS, it is unable to produce or obtain energy from the aforementioned sources, and must therefore survive by feeding on the remains of other organisms, or heterotrophs like itself.
Lactobacillus Bulgaricus, is, again very acid tolerant, as it is a lactic acid bacteria. It survives on a restricted carbohydrate count. Lactobacillus Bulgaricus also has a "fermentative" metabolism, with D - lactic acid being the main product.
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