Question

which of the following statements describe how microbes can benefit other organisms in their environment?
correct answer(s)
microbes use fermentation to produce alcohols and acids.
microbes use nitrogen fixation to supply plants with ammonia or nitrate.
microbes cycle nutrients back into the environment.
microbes use quorum sensing to detect the arrival of harmful bacteria.
methanogens remove methane from the atmosphere, thereby reducing global warming.
incorrect answer(s)

Explanation:

• Microbes use fermentation to produce alcohols and acids: Fermentation by microbes is used in food production (e.g., yogurt - lactic acid bacteria) and beverage production (e.g., beer - yeast), which can be beneficial for human consumption and industrial use.
• Microbes use nitrogen fixation to supply plants with ammonia or nitrate: Nitrogen - fixing bacteria (e.g., Rhizobium in root nodules of legumes) convert atmospheric nitrogen (\(N_2\)) into ammonia (\(NH_3\)) or nitrate (\(NO_3^-\)), which are essential for plant growth as nitrogen is a key nutrient for plants.
• Microbes cycle nutrients back into the environment: Decomposer microbes break down dead organic matter (e.g., dead plants and animals) into simpler substances (e.g., carbon dioxide, water, and minerals). These nutrients can then be reused by other organisms in the ecosystem.
• Methanogens remove methane from the atmosphere, thereby reducing global warming: Methane (\(CH_4\)) is a potent greenhouse gas. Methanotrophic microbes can oxidize methane, reducing its concentration in the atmosphere and thus having a beneficial impact on the global climate.
• Microbes use quorum sensing to detect the arrival of harmful bacteria: Quorum sensing is a communication mechanism among bacteria. While it is an important microbial behavior, it is more about bacterial - bacterial interactions and regulation of gene expression within a bacterial population rather than a direct benefit to other organisms in the environment in the context of the question (which is about how microbes benefit other organisms).

Answer:

• Correct Answer(s):
• Microbes use fermentation to produce alcohols and acids.
• Microbes use nitrogen fixation to supply plants with ammonia or nitrate.
• Microbes cycle nutrients back into the environment.
• Methanogens remove methane from the atmosphere, thereby reducing global warming.
• Incorrect Answer(s):
• Microbes use quorum sensing to detect the arrival of harmful bacteria.