Kingdom Protista:

This kingdom involves eukaryotic unicellular mainly aquatic cells. They exhibit the characters which are as shown below:

A. They contain a typical Eukaryotic cell organization.

B. They frequently bear cilia or flagella for locomotion. Mainly they are photosynthetic autotrophs. They form the main producers of food in fresh and in water oceans. All unicellular plants are together termed as phytoplanktons and unicellular animals as zooplanktons. Phytoplanktons are photosynthetically active and contain cell wall.

C. Zooplanktons are generally predatory. They exhibit holozoic mode of nutrition as in Amoeba and lack cell wall.

D. Certain protists are parasitic. Some are symbionts whereas others are decomposers.

Euglena, a protozoan contains two modes of nutrition. In the existence of sunlight it is autotrophic and in the deficiency of sunlight it is heterotrophic. This mode of nutrition is termed as myxotrophic and therefore they form a border line between animals and plants and can be categorized in both.

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