Question

what are types are protozoans​

Answer 1

Answer:

Organisms known as protozoa include a wide range of organisms, most of which are free-living single-celled eukaryotes. Therefore, protozoa fit into the Domain Eukarya. Although the different phyla of the kingdom Protista are not closely related, they are nonetheless classified together because of their large differences from the other kingdoms of plants, animals and fungi. The name “protozoa” has a dynamic history, at one time including only the “animal-like” unicellular forms of life. Today, these heterotrophic protozoa are lumped together with the autotrophic algae and other simple forms of life into the Kingdom Protista. While all protozoa are eukaryotes, not all reproduce with the standard model of mitosis that is seen in higher animal cells. Many have complex cellular division that resembles binary fission in bacteria, on a larger scale. Some phyla in the Kingdom Protista are autotrophic cells, containing chloroplasts which can produce sugars from sunlight. Although only heterotrophic organisms were considered protozoa historically, this article will present many of the phyla within Protista that can photosynthesize sugars. Below is an image of a ciliate protozoa.

Answer 2

Protozoans

All protozoans are heterotrophs and live as predators or parasites.They are believed to be primitive relatives of animals.

There are four major groups of protozoans. They are,

1) Amoeboid protozoans :

$\bigstar$ These organisms live in fresh water, sea water or moist soil.

$\bigstar$ They move and capture their prey by putting out pseudopodia.

$\bigstar$ Marine forms have silica shells on their surface.

Example :- Amoeba, Entamoeba.

2) Flagellated protozoans :

$\bigstar$ The members of this group are either free-living or parasitic. They have flagella.

$\bigstar$ The parasitic forms cause diaseases such as sleeping sickness

Example :- Trypanosoma.

3) Ciliated protozoans :

$\bigstar$ These are aquatic, actively moving organisms because of the presence of thousands of cilia.

$\bigstar$ They have a cavity (gullet) that opens to the outside of the cell surface

$\bigstar$ The coordinated movement of rows of cilia causes the water laden with food to be steered into the gullet

Example :- Paramecium

d) Sporozoans :

$\bigstar$ This includes diverse organisms that have an infectious spore-like stage in their life cycle.

$\bigstar$ The most notorious is Plasmodium (malarial parasite) which causes malaria which has a staggering effect on human population.