Fig. 1: A key to the five kingdoms as a flow chart. First question: does the cell have a true nucleus? No gives Monera. Yes leads to: is the body many-celled? No gives Protista. Many leads to: does it make its own food by photosynthesis? Yes gives Plantae. No leads to: does it have a wall of chitin and absorb its food? Yes gives Fungi, and no gives Animalia. A note says that this is a simplified key, that yeast is a single-celled fungus, and that some protists make their own food.