Plant-Like Protists: Algae

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Diatoms are single-celled algae. Other forms of algae are multicellular.

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Why are algae taken into consideration plant-like? The main factor is that they contain chloroplasts and produce food via photosynthesis. However before, they lack many type of various other structures of true plants. For example, algae execute not have roots, stems, or leaves. Some algae likewise differ from plants in being motile. They might move with pseudopods or flagella. Although not plants themselves, algae were most likely the ancestors of plants.

Ecology of Algae

Algae play considerable roles as producers in aquatic ecosystems. Microscopic forms live suspfinished in the water column. They are the main component of phytoplankton. Because of this, they add to the food base of a lot of marine ecounits.

Multicellular seaweeds referred to as kelp may thrive as big as trees. They are the food base of ecodevices referred to as kelp forests (see Figure below). Kelp woodlands are found throughout the ocean in tempeprice and arctic climates. They are very fertile ecodevices.


Kelp Forest. This kelp woodland supports a huge area of many various other types of organisms.

Group of Algae

Types of algae encompass red and green algae, and also euglenids, and dinoflagellates (see Table below for examples). Scientists think that red and green algae evolved from endosymsdrta.nettic relationships through cyanobacteria. Their chloroplasts have two membranes bereason the cell membranes of the cyanobacteria ended up being additional plasma membranes of the chloroplasts. Scientists think that euglenids and dinoflagellates progressed later on, from endosymsdrta.nettic relationships via green and also red algae. This is why their chloroplasts have actually 3 membranes. Differences in the types of chlorophyll in the four forms of algae likewise assistance the hypothesized evolutionary relationships.

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Type of Algae Origin of Chloroplast Type of Chloroplast

Red algae


cyanobacteria two membranes, chlorophyll prefer the majority of cyanobacteria

Environment-friendly algae


cyanobacteria 2 membranes, chlorophyll like a minority of cyanobacteria



green algae 3 membranes, chlorophyll like green algae