Question

What type of nutrition is found in purple and green sulfur bacteria?
A. Photoautotrophic
B. Chemoautotrophic
C. Photoheterotrophic
D. Chemoheterotrophic

Answer 1

Hint: The purple sulfur bacteria is also known as the PSB. They are a member of the group of proteobacteria. These bacteria are capable of performing photosynthesis. Moreover, green sulfur bacteria are also a member of proteobacteria. These bacteria can also perform photosynthesis.

Complete answer: The nutrition found in purple and green sulfur bacteria is known as the photoautotrophic type of nutrition. In this type of nutrition, the organism captures the photons from the sunlight and produces organic compounds such as carbohydrates, etc., and derives energy from them to survive. The energy from the sunlight is also used to carry out various metabolic processes present in the cells of the bacteria. These organisms synthesize their food from inorganic sources by using photons of sunlight as energy. These organisms are of two types. These two types are namely oxygen and anoxygenic. The oxygenic type uses chlorophyll to capture light. On the other hand, the anoxygenic type has a substance called the bacteria chlorophyll that absorbs the light at non-optical wavelengths which are used to create energy for the organisms. Thus, based on the above information we can conclude that the purple and green sulfur bacteria have a photoautotrophic type of nutrition.
Hence, the correct answer is option (A).

Note: The purple sulfur bacteria reduce the carbon dioxide of the atmosphere to organic molecules like carbohydrates with the help of hydrogen sulfide instead of water. On the other hand, the green sulfur bacteria are strictly anaerobic. However, both the purple sulfur bacteria and the green sulfur bacteria are a major part of the group of sulfur bacteria.