Question

WRITE A NOTE ON PROTOZOAN PROTISTS ?

Answer 1

The taxonomic kingdom Protistais a collection of single-celled organisms that do not fit into any other category. Protists are a group made up of protozoa, unicellular algae, and slime molds. We will concentrate on the animal portion of this group: the protozoa (proto = first, zoa = animals).

Answer 2

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ANSWER
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PROTOZOAN PROTISTS

⚫️ IT includes all unicellular ( or acellular) eukaryotic animals . these are most primitive organisms considered as animals because of heterotrophic nutrition and motility. about 50,000 species ( 30,000 present and 20 ,000 extinct ) are so far known.


⚫️ Brief history : protozoans were first studied by Leeuwenhoek ( 1677). the name " protozoa " was coined by Goldfuss ( 1817) . the branch of their study is called protozoolozy.


General characters


protozoans are the simple and primitive organisms .

they are free living or parasitic .

all the free living forms are aquatic.

they are asymmetrical or radially symmetrical or bilaterally symmetrical .

they are unicellular ( acellular)

they have protoplasmic grade of organization.

locomotion is effected by flagella, cillia , or pseudopodia.

Nutrition is holophytic , holozolic , saprozoic , or parasitic.

Digestion is intracellular .

excretion and respiration occurs by diffusion.


in fresh water protozoans osmoregulation is carried out by the contractile vacuoles.

Encystment is common phenomenon.



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