Among the options provided, fungi are the organisms that are not photoautotrophic. Fungi, unlike photoautotrophic protists and the Monera group (which primarily includes bacteria capable of photosynthesis), do not perform photosynthesis. Instead, fungi are heterotrophic organisms, meaning they obtain their nutrients by absorbing organic matter from their environment.
Photoautotrophic protists, such as algae, utilize sunlight, carbon dioxide, and water to produce their food through the process of photosynthesis. Similarly, some bacteria within the Monera kingdom, like cyanobacteria, can convert light energy into chemical energy through photosynthesis. On the other hand, fungi play a crucial role in decomposition, breaking down dead organic material, which helps recycle nutrients in ecosystems.