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Questions and Answers
How many families are represented in the Order II: Chlorococcales?
How many families are represented in the Order II: Chlorococcales?
- Two
- Three (correct)
- Five
- Four
What type of cells are found in the family Protosiphonaceae?
What type of cells are found in the family Protosiphonaceae?
- Unicellular uninucleate
- Multicellular multinucleate
- Unicellular multinucleate (correct)
- Multicellular uninucleate
What is the main characteristic of the genus Pediastrum?
What is the main characteristic of the genus Pediastrum?
- Colonial forms
- Peripheral cells with protrusions (correct)
- Unicellular forms
- Multinucleate cells
How does asexual reproduction occur in Pediastrum?
How does asexual reproduction occur in Pediastrum?
What is the type of sexual reproduction in Pediastrum?
What is the type of sexual reproduction in Pediastrum?
What is the name of the other genus in the Hydrodictyaceae family?
What is the name of the other genus in the Hydrodictyaceae family?
What is the shape of the Oogonium?
What is the shape of the Oogonium?
What is the term for species that form small flattened antheridia?
What is the term for species that form small flattened antheridia?
What is the shape of the cells in Nets?
What is the shape of the cells in Nets?
What is the characteristic of the chloroplast in Nets?
What is the characteristic of the chloroplast in Nets?
What is the function of the distal end of the filament?
What is the function of the distal end of the filament?
How do members of the Ulothricaceae family reproduce vegetatively?
How do members of the Ulothricaceae family reproduce vegetatively?
What is the term for the swarmer released from an antheridial-like cell?
What is the term for the swarmer released from an antheridial-like cell?
What is the shape of the filament in Ulothrix?
What is the shape of the filament in Ulothrix?
What happens to the androspores after they swim towards the oogonium?
What happens to the androspores after they swim towards the oogonium?
What is the term for the small filamentous structure that develops from an androspore?
What is the term for the small filamentous structure that develops from an androspore?
What is the shape of the chloroplast in Ulothrix?
What is the shape of the chloroplast in Ulothrix?
What type of flagella do the zoospores in Ulothrix have?
What type of flagella do the zoospores in Ulothrix have?
What is the characteristic of the life cycle of Ulothrix?
What is the characteristic of the life cycle of Ulothrix?
What is the function of the flagella in Oedogonium?
What is the function of the flagella in Oedogonium?
What is the characteristic of the nucleus in Oedogonium cells?
What is the characteristic of the nucleus in Oedogonium cells?
What is the purpose of the holdfast in Oedogonium?
What is the purpose of the holdfast in Oedogonium?
What is the characteristic of the chloroplasts in Oedogonium?
What is the characteristic of the chloroplasts in Oedogonium?
What is the term for the residual portions of cells that divide to bring about intercalary growth?
What is the term for the residual portions of cells that divide to bring about intercalary growth?
What is the mode of sexual reproduction in Oedogonium?
What is the mode of sexual reproduction in Oedogonium?
What is the characteristic of the filaments in Oedogonium?
What is the characteristic of the filaments in Oedogonium?
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.
