There are about 70,000 different types of unicellular animals. They live in fresh and sea water, in soil, in the body of multicellular animals and even in humans. Protozoa can move with the help of pseudopods, flagella, cilia and other devices.
Instructions
Step 1
There are more than 100 species of amoebas. They all have a naked body, and they move with the help of pseudopods, which is why, due to the external similarity of pseudopods with plant roots, these protozoa are referred to as rhizopods. The semi-liquid cytoplasm that makes up the body of the amoeba is constantly moving, forming protrusions and facilitating the movement of the animal.
Step 2
Foraminifera, marine rhizomes, have a calcareous shell. The pseudopods protrude through the mouth and pores of the shells in the form of long intertwining threads. From the shells of dead animals, deposits of marine rocks and sediments are formed.
Step 3
Marine amoebas also include ray beetles, or radiolarians, resembling small stars, thorny balls, snowflakes and other bizarre figures. These unicellular organisms float in the water column. Their shells, consisting of silica, subsequently form large deposits.
Step 4
In polluted reservoirs with stagnant water lives, feeding on decaying leaves, green euglena - flagellate. It has a blunt front end of the body and a pointed rear end, and a dense outer layer of cytoplasm helps it maintain a constant shape. At the front end of the body there is a flagellum - a thin filamentous outgrowth of the cytoplasm. Rotating the flagellum, the euglena is screwed into the water and floats with the blunt end forward. The body of the unicellular organisms almost does not change during movement.
Step 5
It is interesting to note how Volvox, a colony of flagellated protozoa, travels. About 1000 unicellular organisms, similar to green euglena, are collected in a single ball, and each of them has two flagella sticking out. With the help of these flagella, the Volvox is rolled in the water.
Step 6
There are more than 7000 types of ciliates, but the most famous of them is the ciliate shoe. All of them have numerous cilia on the surface of the body, with the help of which they move in water and scoop food - bacteria, small algae, single-celled animals - to their mouths. All ciliates are characterized by the presence of large and small nuclei.
