Plants are mainly multicellular organisms, predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, plants were treated as one of two kingdoms including all living things that were not animals, and all algae and fungi were treated as plants.
According to Cavalier-Smith, the kingdom originally included only algae, but his later analysis indicated that many protozoans also belong to the new group. As of 2018, the kingdom is as diverse as kingdoms Plantae and Animalia, consisting of eight phyla.
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Combined with the five-kingdom model, this created a six-kingdom model, where the kingdom Monera is replaced by the kingdoms Bacteria and Archaea. This six-kingdom model is commonly used in recent US high school biology textbooks, but has received criticism for compromising the current scientific consensus. 
- Alternative Classifications
Superregnum: Eukaryota Regnum: Plantae Divisiones: Charophyta –Chlorophyta –Glaucophyta –Rhodophyta – Anthocerotophyta –Bryophyta –Marchantiophyta –Tracheophyta †Incertae sedis
The circumscription of Kingdom Plantae varies greatly from author to author, for other senses of "Plantae" see: 1. Archaeplastida Adl et al., 2005 2. Embryophyta (= Plantae sensu Margulis, 1971) 3. Plantae (L.) 4. Viridiplantae (= Plantae sensu Copeland, 1938, 1956)Becker, B. & Marin, B. (2009) Streptophyte algae and the origin of embryophytes.Annals of Botany 103 (7): 999–1004.Haeckel, G. (1866) Generale Morphologie der Organismen. Berlin: Verlag von Georg Reimer, vol.1: i–xxxii, 1–574, pls I–II; vol. 2: i–clx, 1–462, pls I–VIII.Kenrick, Paul & Crane, Peter R. (1997) The Origin and Early Diversification of Land Plants: A Cladistic Study. Washington, D. C.: Smithsonian Institution Press. ISBN 1-56098-730-8.Lewis, Louise A. & McCourt, R.M. (2004) Green algae and the origin of land plants.American Journal of Botany 91 (10): 1535–1556.
The kingdom Plantae is defined in various ways by different biologists (see Current definitions of Plantae).All definitions include the living embryophytes (land plants), to which may be added the two green algae divisions, Chlorophyta and Charophyta, to form the clade Viridiplantae.
Kingdom Plantae. Kingdom Plantae includes green, brown and red algae, liverworts, mosses, ferns and seed plants with or without flowers. They have the following characteristics: They are multicellular organisms with walled and frequently vacuolate eukaryotic cells. These contain photosynthetic pigment in plastids.
Jul 09, 2019 · The Plant Kingdom or the Kingdom Plantae comprises 17% of the total species studied by mankind to date. In number, it comes out to be nearly 2,21,000.
Plant Kingdom – Plantae Kingdom Plantae includes all the plants. They are eukaryotic, multicellular and autotrophic organisms. The plant cell contains a rigid cell wall.