Question

The lactobacilli, in their role as normal flora of the vagina, help the vagina resist infection by contributing to A. the neutrality of the vaginal mucus.B. acidity of the vagina.C. food for the resident vaginal flora.D. fertility of the host.

Answer 1

Answer:

B. acidity of the vagina

Explanation:

The genus Lactobacillus includes rods and coccobacilli that lack catalase and produce lactic acid as the main fermentation product. Lactobacilli grow optimally under slightly acidic conditions. They are part of the normal flora of the human body and are present in the intestinal tract, vagina, etc.

In the human female vagina, the Lactobacilli are rarely pathogenic and rather serve as antimicrobial agents and prevent the growth of pathogenic microbes by imparting acidic pH to the vagina. Production of lactic acid by these bacteria imparts acidic pH and allows them to serve as antimicrobial agents.