1. Fungi, and members of the Monera and Protista having cell walls have now been excluded from Plantae 2. Earlier classifications also have placed them in Plantae 3. The cyanobacteria that are also referred to as blue green algae are not ‘algae’ any more. Regarding 1,2 and 3:
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Living organisms are classified based on morphological and anatomical differences into 5 kingdoms.
- Initially, Carolus Linnaeus classified all plants and animals into two kingdoms -Plantae and Animalia.
- R.H.Whittaker later proposed the Five Kingdom Classification. Here he defined the kingdoms Monera, Protista, Fungi, Plantae and Animalia.
- Earlier classifications failed to differentiate organisms based on prokaryotic and eukaryotic features, photosynthetic, etc. The five kingdoms clearly classified all organisms.
- Fungi and members of Monera and Protista were initially part of Plantae because they all had cell walls. Yet they differed widely based on several characteristics such as cell wall composition and photosynthetic nature.
- Blue-green algae is called so because it has photosynthetic properties that are similar to algae placed under kingdom Plantae. Although both have chlorophyll and are autotrophs, they differ structurally.
- For example, Nostoc is filamentous with nitrogen -fixing cells called heterocysts. These are absent in regular algae.
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