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  • Which of the following organisms is known as taxonomic puzzle?Option: 1 NoctilucaOption: 2</st

Which of the following organisms is known as taxonomic puzzle?

Option: 1

Noctiluca


Option: 2

Euglena


Option: 3

Paramecium


Option: 4

Phacus


Answers (1)

best_answer

Euglenoids

  • Euglenoids include Euglena like flagella bearing organisms.
  • These are found in freshwater habitats and damp, moist soil.
  • Mode of nutrition is mixotrophic i.e. both autotrophic and heterotrophic (saprobic or holozoic). Autotrophic forms can turn heterotrophic in dark conditions.
  • Euglenoids are unicellular, flagellates .
  • Cell lacks a cellulosic cell wall instead of a proteinaceous, thin and flexible layer called pellicle is present. It allows changes in shape.
  • Euglenoids possess two flagella one is long the other is short. Flagella bears hairs.
  • A red pigment called astaxanthin is present in eyespot.
  • Pigments like chlorophyll a, b are present.
  • Reserve food material is paramylon
  • Reproduction is by longitudinal binary fission
  • Examples include Euglena, Phacus Peranema

Euglena is called the taxonomic puzzle because its features are similar to both plant and animal cells. Cell wall is an animal feature and presence of choloroplast is a plant character of Euglena. 

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