An instance of purple non-sulphur bacteria is___________?
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Answer: C. Photosynthetic bacteria
Explanation
Purple non-sulphur bacteria belong to a specialized group of photosynthetic bacteria utilizing light energy. Microbiological classification confirms that purple non-sulphur bacteria perform photosynthesis without using hydrogen sulphide. These organisms harness light to drive carbon fixation and metabolic processes as photosynthetic bacteria. Purple non-sulphur bacteria are typically anoxygenic phototrophs capable of growing under diverse metabolic modes. They use organic compounds as electron donors for carbon assimilation rather than relying on hydrogen sulphide. Bacteriochlorophyll pigments located in internal membrane systems absorb light energy for their metabolism.
Environmental microbiologists study these bacteria to understand primitive metabolic pathways and biogeochemical cycles. Biotechnologists utilize purple non-sulphur bacteria for wastewater treatment and sustainable hydrogen gas production. Ecological research examines their roles in aquatic sediment microbial communities and carbon cycling. Option A describes heterotrophic bacteria, ignoring the distinct photosynthetic capabilities of these organisms. Option B refers to chemosynthetic bacteria, whereas purple non-sulphur bacteria derive energy primarily from light. Option D refers to saprotrophic bacteria, which decompose dead matter rather than performing anoxygenic photosynthesis.
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