All eukaryotic, chlorophyll-containing organisms fall under Kingdom Plantae. Kingdom Plantae includes algae, bryophytes, pteridophytes, gymnosperms and angiosperms. Plant cells are characterised by the presence of a cell wall, which is made up of cellulose. While most plants are autotrophs, some are insectivorous and parasitic. Most plants have two alternate phases in their life cycle: the diploid sporophytic phase and the haploid gametophytic phase. The phenomenon of alternation of sexual and asexual forms in the lifecycle is referred to as “alternation of generation”.
Kingdom Animalia includes heterotrophic, multicellular eukaryotic animals. They depend on plants for food, directly or indirectly. Animals have a holozoic mode of nutrition- ingestion of food takes place through the mouth and passes through the gastro-intestinal tract. Animals reproduce sexually after a male and female copulate, which is followed by embryological development. Higher forms of animals have sensory and neuromotor mechanisms and most of the animals are motile.