Question

give 2 examples of protozoa​

Answer 1

Answer:

examples of protozoa

Explanation:

Phylum Euglenida

phylum kinetoplastidia

Answer 2

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.

Examples of Protozoa

• Malaria

Malaria is a disease that effects hundreds of millions of people worldwide, every year. It is estimated that malaria kills three million people a year, half of which are young children. Malaria is caused by several protozoa in the genus Plasmodium.

• Red Tide

An interesting phenomena in the ocean is also caused by another phylum of protozoa. The Dinoflagellates are a group of protozoa that exist mainly as free-swimming unicellular organisms, while other exist symbiotically within certain invertebrates. Groups of dinoflagellates that are free swimming can undergo drastic periods of reproduction, known as blooms.

Types of Protozoa

There are many phyla in the Domain Protista. While this represents a wide variety of them, it is not close to all of them. Part of the reason there is so much diversity in this domain is that the phyla are not closely related.

• Phylum Euglenida

The Euglenida are a phylum of protozoa recognized by the pellicle that gives them shape and the flagella which they use for locomotion.

• Phylum Kinetoplastida

Closely related to the Euglenida, the Kinetoplastida are also protected by a pellicle, although it is made exclusively of microtubules. Organisms in the Kinetoplastida share the unique characteristic of having a single, much enlarged and elongated, mitochondrion.

• Phylum Ciliophora

Instead of flagella for locomotion, organisms in the phylum Ciliophora use much smaller structures called cilia. The cilia of these organisms cover their entire cell, and work together to propel the cell forward. Much like the individual paddles of a row boat, each cilia gives a forward moving power stoke, then whips back to the starting position in the recovery stroke. Organisms in the Ciliophora include a wide variety of body plans, including free-swimming organisms and sessile organisms that use their cilia to filter food from the water.

• Phylum Apicomplexa

As seen in Example #1, the Apicomplexa include mostly parasitic organisms that exist solely within their host organisms. These organisms all have apical complexes, which allow them to gain entry into their host’s cells. Inside the cells, the parasites are much more resistant and have better access to nutrients.

• Phylum Dinoflagellata

Seen in Example #2, the dinoflagellates use flagella to locomote and are also covered by a pellicle. Unlike the two previous groups with pellicles, the dinoflagellates use a series of vesicles beneath the cell membrane to create a rigid form. Some dinoflagellates even fill their vesicles with polysaccharides, like cellulose, to create a form of armor that protects their cells.

• Phylum Stramenopila

The Stramenopila includes a wide variety of organisms, from the shelled diatoms to brown and golden algae. Protozoa in this phylum have shells, scales, or tests that support the cell. These protective covering vary widely across the phylum.

• Phylum Rhizopoda

The phylum Rhizopoda contains the amoebas. The small, unicellular protozoa are some of the only protozoa that do not have any sort of hard covering. The amoebas move by extending their cytoplasm into the environment. These extensions are called pseudopodia.

• Phylum Actinopoda

The organisms in Actinopoda have characteristic axopodia, which are sharp spines that extend from the cell and are covered in cytoplasm. They are used in locomotion and feeding. The axopodia also produce beautiful shapes.

• Phylum Granuloreticulosa

The Granuloreticulosa includes a variety of organism that have immense industrial value. The tests produced by these protozoa aggregate in huge numbers on the bottom of marine environments. Over time they fossilize together and become substances like chalk, limestone, and marble. Even the pyramids of Egypt were built from stones that originated from the shells of these protozoans.

• Phylum Diplomonodida

The Diplomonodida are a phylum of organisms that have many flagella for locomotion. The average number is around 8. While there are many species that vary in their place in the ecosystem, the most well-known of these protozoa is the genus Giardia, which can be consumed in unclean water and cause flu-like symptoms and diarrhea in humans.

• Phylum Parabasilida

These organisms contain many flagella, up to thousands on a single cell, and have a special fiber that attached the Golgi apparatus to the base of the flagella.

• Other Protozoa

Several other phyla of protozoa exist, but cannot be covered here. Like all other protozoans, these organisms lack specialized tissues or layers of cells. Most are unicellular, although some exist in colonies or fibers. Due to their small size an adaptability, the protozoa have occupied nearly every environment on the planet.