What defines autotrophic bacteria?

Autotrophic bacteria are characterized by their ability to produce their own food from inorganic substances, such as carbon dioxide and minerals, through processes like photosynthesis or chemosynthesis. This self-sufficient mechanism is essential for their survival, as it allows them to convert simple inorganic materials into complex organic molecules, which they can then use for energy and growth.

This characteristic distinguishes them from heterotrophic bacteria, which require organic compounds produced by other organisms as a source of nutrients. Autotrophic bacteria play a crucial role in ecosystems, particularly in nutrient cycling and energy flow, as they can serve as primary producers, forming the base of the food web in many environments.