Diversity of microorganisms — A/L Biology

A. Nature and Types of Microorganisms Definition: Microorganisms are microscopic living organisms that are too small to be seen with the naked eye, existing as unicellular or multicellular entities with diverse biological characteristics. Explanation: Microorganisms encompass a vast array of microscopic life forms including bacteria, archaea, protists, fungi, and viruses. They exist in virtually every environment on Earth, from extreme hot springs to deep ocean vents. Their microscopic nature allows them to occupy ecological niches inaccessible to larger organisms. They can be beneficial (like gut bacteria), neutral, or pathogenic (disease-causing). The study of microorganisms is crucial for understanding fundamental biological processes, disease mechanisms, and industrial applications. Think of it as: Think of microorganisms as an invisible workforce that operates everywhere - some are helpful workers in factories (like yogurt production), some are maintenance crew (decomposers), while others are troublemakers (pathogens) that need to be controlled.