Plant-Like Protists: algae

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Diatoms space single-celled algae. Other develops of algae space multicellular.

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Why space algae considered plant-like? The main reason is the they save chloroplasts and also produce food through photosynthesis. However, they lack countless other structures of true plants. For example, algae execute not have roots, stems, or leaves. Part algae likewise differ from plants in gift motile. They might move through pseudopods or flagella. Although no plants themselves, birds were more than likely the ancestors the plants.


Ecology of Algae

Algae play significant roles together producers in aquatic ecosystems. Microscopic develops live suspended in the water column. They are the main component of phytoplankton. Together such, they contribute to the food basic of most marine ecosystems.

Multicellular seaweeds dubbed kelp may prosper as large as trees. They are the food basic of ecosystems dubbed kelp forests (see Figure below). Kelp woodlands are discovered throughout the s in temperate and also arctic climates. They are highly fertile ecosystems.

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Kelp Forest. This kelp forest supports a big community of plenty of other species of organisms.


Classification that Algae

Types of algae incorporate red and also green algae, and also euglenids, and dinoflagellates (see Table below because that examples). Scientists think the red and also green algae evolved from endosymlifwynnfoundation.orgtic relationships with cyanobacteria. Their chloroplasts have two membranes because the cabinet membranes of the cyanobacteria became extr plasma membrane of the chloroplasts. Researchers think that euglenids and dinoflagellates advanced later, native endosymlifwynnfoundation.orgtic relationships with green and red algae. This is why your chloroplasts have actually three membranes. Differences in the varieties of chlorophyll in the four types of algae also support the hypothesized evolution relationships.

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kind of Algae beginning of Chloroplast kind of chloroplast

Red algae

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cyanobacteria two membranes, chlorophyll favor the bulk of cyanobacteria

Green algae

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cyanobacteria two membranes, chlorophyll prefer a decimal of cyanobacteria

Euglenids

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green algae three membranes, chlorophyll like green algae

Dinoflagellates


Reproduction the Algae

Algae have varied life cycles. Two examples are displayed in Figure below. Both cycles incorporate phases of asexual reproduction (haploid, n) and sexual reproduction (diploid, 2n). Why walk to so much trouble to reproduce? Asexual reproduction is fast, yet it doesn’t create new genetic variation. Sex-related reproduction is more complicated and risky, however it creates brand-new gene combinations. Each strategy might work much better under various conditions. Rapid populace growth (asexual reproduction) is adaptive when problems are favorable. Genetic variation (sexual reproduction) helps ensure that some organisms will endure if the setting changes.