Correct answer: Plantae
According to Whittaker's five kingdom classification system, all the organisms are divided into five kingdoms,
1. Kingdom Monera includes all the prokaryotic bacteria.
2. Kingdom Protista includes the unicellular eukaryotes.
3. Kingdom Fungi includes all the multicellular decomposers.
4. Kingdom Plantae comprises all the autotrophic, multicellular eukaryotic organisms with specific cell walls made up of cellulose.
5. Kingdom Animalia includes multicellular eukaryotes without a cell wall.
