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Questions and Answers
How many families are represented in the Order II: Chlorococcales?
What type of cells are found in the family Protosiphonaceae?
What is the main characteristic of the genus Pediastrum?
How does asexual reproduction occur in Pediastrum?
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What is the type of sexual reproduction in Pediastrum?
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What is the name of the other genus in the Hydrodictyaceae family?
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What is the shape of the Oogonium?
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What is the term for species that form small flattened antheridia?
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What is the shape of the cells in Nets?
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What is the characteristic of the chloroplast in Nets?
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What is the function of the distal end of the filament?
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How do members of the Ulothricaceae family reproduce vegetatively?
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What is the term for the swarmer released from an antheridial-like cell?
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What is the shape of the filament in Ulothrix?
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What happens to the androspores after they swim towards the oogonium?
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What is the term for the small filamentous structure that develops from an androspore?
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What is the shape of the chloroplast in Ulothrix?
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What type of flagella do the zoospores in Ulothrix have?
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What is the characteristic of the life cycle of Ulothrix?
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What is the function of the flagella in Oedogonium?
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What is the characteristic of the nucleus in Oedogonium cells?
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What is the purpose of the holdfast in Oedogonium?
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What is the characteristic of the chloroplasts in Oedogonium?
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What is the term for the residual portions of cells that divide to bring about intercalary growth?
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What is the mode of sexual reproduction in Oedogonium?
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What is the characteristic of the filaments in Oedogonium?
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Study Notes
Order II: Chlorococcales
- Comprises three families: Chlorococcaceae, Protosiphonaceae, and Hydrodictyaceae
- Hydrodictyaceae family:
- Example: Pediastrum and Hydrodictyon
- Pediastrum:
- A planktonic flat colony with peripheral cells having one or two protrusions
- Asexual reproduction by autocoenobia formation
- Sexual reproduction is isogamous
- Isogametes produce a diploid zygote, which germinates to produce zygospores
- Hydrodictyon:
- Means "water net" due to its cylindrical shape with closed ends
- Cells are cylindrical with many nuclei in the peripheral cytoplasm
- Chloroplast is reticulate with multiple pyrenoids
- Asexual reproduction is mainly through autocoenobia formation
- Sexual reproduction is isogamous
Order III: Ulothricales
- Family: Ulothricaceae
- Members are found in various habitats, including freshwater, marine, and soil
- Algae reproduce:
- Vegetatively by fragmentation
- Asexually by zoospores, aplanospores, or hypnospores
- Sexually by isogametes or anisogametes
- Ulothrix:
- Unbranched, uniseriate cylindrical filament
- Cells have a single chloroplast with one or many pyrenoids
- Nucleus is enclosed in the chloroplast
- Reproduction:
- Vegetative: by fragmentation
- Asexual: by zoospores, aplanospores, or hypnospores
- Sexual: by isogametes
Order IV: Oedogoniales
- Family: Oedogoniaceae
- Only family in this order, comprising three genera: Oedogonium, Bulbochaete, and Oedocladium
- Oedogonium:
- Unbranched, uniseriate filament with uninucleate cells
- Occurs in freshwater, attached to a substrate by a basal holdfast
- Chloroplasts have many pyrenoids
- Nucleus lies in the cell periphery
- Filaments are polar due to the presence of a holdfast
- Reproduction:
- Vegetative: by fragmentation
- Asexual: by zoospores, akinetes, or aplanospores
- Sexual: by oogamy
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Description
Learn about the characteristics and classification of Algae Order II: Chlorococcales, including its three families and examples of genera such as Pediastrum and Hydrodictyon.
