Answer:
Autotrophic organisms, which can produce their own food through photosynthesis or chemosynthesis, are primarily found in the Kingdom Plantae and the Kingdom Bacteria.
1. **Kingdom Plantae:** This kingdom includes all plants, which are autotrophic and perform photosynthesis to produce their own food using sunlight, water, and carbon dioxide.
2. **Kingdom Bacteria:** Some bacteria are also autotrophic. They can be photosynthetic, like cyanobacteria, which perform photosynthesis similar to plants.
It's important to note that autotrophic organisms are not exclusive to a single kingdom, but these two are significant contributors. If you have more specific details or a particular context, feel free to provide additional information for a more tailored response.