Why is green euglena attributed both to the kingdom of plants and to the kingdom of animals?

The structure of green euglena is quite simple, it resembles the structure of all plant flagellum organisms. In the cell there is one shaped nucleus surrounded by a nuclear membrane. There are many chromatophores in the cytoplasm – special organoids containing the chlorophyll pigment necessary for photosynthesis and providing the possibility of this process. By their ultramicroscopic structure, the chromatophores resemble chloroplasts in the cells of higher plant organisms. Euglena green is capable of photosynthesis only in the presence of light. In the dark, representatives of the species switch to a heterotrophic (saprophytic) type of nutrition (similarity to animal organisms). The so-called “eye” (stigma) allows the simplest to perceive light. Regulation of osmotic pressure and partial elimination of waste products is carried out using contractile vacuole. The flagellum is an important organoid of the cell; with its help, green euglena moves and feeds.
Euglene green is attributed both to the kingdom of plants and to the kingdom of animals, because it includes in its life traits of both one and the other. For example, she eats autotrophically, in her body there is chlorophyll, thanks to which she carries out the process of photosynthesis, which is typical for plants. On the other hand, as an euglena animal actively moves and feeds in a heterotrophic way – it eats small animals, unicellular algae. If euglena is in the dark for a long time, then chlorophyll disappears, and euglena begins to feed only in a heterotrophic way.

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