Bacteria : Decomposition ::OptionsVolcano : EruptionYeast : FermentationOxygen : TreatmentAntibiotic : Injectionnone of these

To solve the analogy "Bacteria : Decomposition", we need to find a pair from the options that has a similar relationship, where the first term is an agent or cause of the second term.

1. Understanding the Relationship

   • Bacteria are microorganisms that primarily lead to decomposition, breaking down organic matter as a natural process.

2. Analyzing the Options

   • Volcano : Eruption - A volcano causes an eruption, but this relationship is more about a natural phenomenon rather than a biological process.
   • Yeast : Fermentation - Yeast is a key agent in fermentation, as it breaks down sugars to produce alcohol and carbon dioxide, similar to how bacteria break down organic matter.
   • Oxygen : Treatment - Oxygen does not specifically act as an agent in a treatment process, making this pair less related.
   • Antibiotic : Injection - Antibiotics are often administered through injections, but they don’t have a cause-and-effect relationship analogous to bacteria and decomposition.
   • None of these - This would apply if none of the pairs demonstrated a similar relationship.

3. Selecting the Best Option

   • The relationship between yeast and fermentation is most similar to that of bacteria and decomposition.

Final Answer

Yeast : Fermentation is the best match for the analogy, as both represent a biological agent causing a specific process.