Algae live in both marine and fresh water. They lack true stems, leaves or roots. Therefore, their body looks like a thallus. There are different phyla of algae based on the type of their photosynthetic pigments. These include phylum Chlorophyta, which includes green algae, phylum Phaeophyta, which includes brown algae, phylum Rhodophyta, which includes red algae, and phylum Bacillariophyta, which includes diatoms.
All these phyla have some general characteristics in common. In addition, almost all are well-adapted to life in water. Furthermore, there is a large diversity among these members in terms of size and form. They include unicellular, filamentous, colonial, and thalloid forms. Protozoans are animal-like eukaryotes belonging to kingdom Protista. Unlike algae, they lack a cell wall and are heterotrophs.
The organisms are always unicellular. One common example of a protozoan is Amoeba. They lack root, true stem, vascular system and leaves.
In contrast, protozoa are prokaryotic organisms belonging to the Protista kingdom. The cell wall of algae is made up of a substance called cellulose. In contrast, the cell wall is absent in protozoa. Algae contain a green coloured pigment in them, called chlorophyll.
Spore is the resting unit of algae. Some examples of algae are cyanobacteria, brown algae, Seaweeds, red algae, green algae. Algae produce toxic chemicals which are hazardous to humans. Protozoa are prokaryotic organisms, i. Protozoa are prokaryotic organisms belonging to the Protista kingdom. Protozoa are organisms possessing animal-like characteristics. Protozoa are not capable of making their food. Some ciliates have specially adapted green algae living inside them.
In higher light conditions, these algae convert the carbon dioxide produced by the ciliate into oxygen, ensuring an abundant internal supply of oxygen for the ciliate. On the flip side, a few groups are anaerobic and intolerant of oxygenated water.
These organisms are often endosymbionts living in the digestive system of multi-celled animals. Protists use contractile vacuoles to remove excess water from their cells.
If the contractile function of a cell is compromised, the cell swells until it ruptures. The same will also happen to a marine protozoan when placed in fresh water; marine members have no contractile vacuoles.
Ciliates have permanent contractile vacuole pathways and pores where amoebas will release them from any point along the surface of its body. Many protozoans reproduce both asexually and sexually during their lifetime. The move to sex is often either controlled by an internal clock or by the arrival of harsh environmental conditions.
The majority of protozoans reproduce asexually by binary fission. However, some are endosymbionts species that live within another organism that often engage in multiple fission with many tiny cells produced from a single parent cell released to search out a new host. Sexual reproduction is common in ciliates, but rare in heliozoans and amoebas, and absent in flagellates.
The three basic types of sex are gametogamy, autogamy, and conjugation—all of which are explained on the reproduction strategies page. Ciliates reproduce sexually through conjugation, which involves the exchange of haploid nuclei between two joined protists. Once the genetic information is exchanged, each of the ex-conjugants clones itself. These resulting daughter cells go through a long period of "sexual immaturity," during which they will only reproduce asexually.
Flagellates employ their flagella for both swimming and acquiring food. Sessile or colony-forming members of the collared flagellates use their flagella to create a water current to draw small food particles, such as water-borne bacteria.
This includes the phylum Chlorophyta which are the green algae; phylum Phaeophyta, brown algae; phylum Rhodophyta, red algae; and phylum Bacillariphyta, diatomic algae. All algae have chlorophyll though they do not have leaves, stems, and roots. They are plant-like organisms that can produce their own food. Algae can either be unicellular or multicellular. Seaweeds are examples of multicellular algae. On the other hand, protozoans are unicellular, and they are more animal-like.
People describe protozoa as a blob without a definite shape since they lack a cell wall. And their method of movement can be through the following extensions of their cells: flagella, the whiplike strands; cilia, also known as pseudopods. Most protozoans feed themselves by ingesting organic molecules or very minute organisms.
The most familiar form of protozoa is the amoebas. These amoebas can cause diseases like malaria. You can find protozoa in aquatic places either saltwater or freshwater. Most protozoans ingest food as they start moving. There are five kingdom classifications in which you can group organisms. Algae and protozoa belong in the Protista kingdom.
Algae and protozoa are very similar to each other since they belong in the same kingdom.
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