What are the meanings of the five kingdoms of life?

The five kingdoms of life are Monera (single-celled prokaryotes), Protista (eukaryotic microorganisms), Fungi (multicellular organisms that absorb nutrients), Plantae (multicellular photosynthetic organisms), and Animalia (multicellular organisms that ingest food). These kingdoms categorize organisms based on their cellular structure, mode of nutrition, and complexity of organization.