Question

Which of the following statement is correct?

• A. Bacteria are either heterotrophic or chemoautotrophic.
• B. All bacteria are heterotrophic.
• C. Bacteria are either phototropic or chemotropic.
• D. Bacteria are either photoautotrophic or chemoautotropic.

Answer 1

Answer: (C)

• Phototrophic bacteria are a group of bacteria, whose energy for growth is derived from sunlight and their source of carbon comes from carbon dioxide or organic carbon.
• Chemoautotrophs use inorganic energy sources such as hydrogen sulfide, elemental sulfur, ferrous iron, molecular hydrogen, and ammonia. Most chemoautotrophs are extremophiles, bacteria or archaea that live in hostile environments.
• Hence, Bacteria are either phototropic or chemotropic is correct.
• So, the correct answer is 'Bacteria are either phototropic or chemotropic'.