Ans. Microorganisms have a significant impact on the environment. They play a crucial role in the decomposition of dead organisms, breaking down complex organic matter into simpler forms. This process helps in recycling nutrients and maintaining the balance of ecosystems. Certain microorganisms also contribute to nitrogen fixation, converting atmospheric nitrogen into a usable form for plants. Additionally, microorganisms are involved in the bioremediation of pollutants, helping to clean up contaminated environments.