Purple non-sulphur bacteria is an example of which of the following?

Explanation

Option A: Heterotrophic bacteria is incorrect because heterotrophic bacteria are bacteria that obtain their energy from organic compounds, rather than sunlight.Option B: Saprotrophic bacteria is also incorrect because saprotrophic bacteria are bacteria that obtain their energy by decomposing dead organic matter.Option C: Chemosynthetic bacteria is also incorrect because chemosynthetic bacteria are bacteria that obtain their energy from the oxidation of inorganic compounds, rather than sunlight.OpytionD: Purple bacteria or purple photosynthetic bacteria are gram-negative proteobacteria that are phototrophic which means they are capable of producing their food via photosynthesis. They are pigmented with bacteriochlorophyll a or b, together with various carotenoids, which give them colours ranging between purple, red, brown, and orange.