Algae Order II: Chlorococcales
26 Questions
6 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

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?

  • Unicellular uninucleate
  • Multicellular multinucleate
  • Unicellular multinucleate (correct)
  • Multicellular uninucleate

    • 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?

    <p>By the formation of autocoenobia (B)</p> Signup and view all the answers

    What is the type of sexual reproduction in Pediastrum?

    <p>Isogamous (D)</p> Signup and view all the answers

    What is the name of the other genus in the Hydrodictyaceae family?

    <p>Hydrodictyon (D)</p> Signup and view all the answers

    What is the shape of the Oogonium?

    <p>Spherical (A)</p> Signup and view all the answers

    What is the term for species that form small flattened antheridia?

    <p>Macrandrous (A)</p> Signup and view all the answers

    What is the shape of the cells in Nets?

    <p>Cylindrical (C)</p> Signup and view all the answers

    What is the characteristic of the chloroplast in Nets?

    <p>It is reticulate and has a number of pyrenoids (C)</p> Signup and view all the answers

    What is the function of the distal end of the filament?

    <p>To function as an antheridium (C)</p> Signup and view all the answers

    How do members of the Ulothricaceae family reproduce vegetatively?

    <p>By fragmentation (D)</p> Signup and view all the answers

    What is the term for the swarmer released from an antheridial-like cell?

    <p>Androspore (A)</p> Signup and view all the answers

    What is the shape of the filament in Ulothrix?

    <p>Unbranched and uniseriate (C)</p> Signup and view all the answers

    What happens to the androspores after they swim towards the oogonium?

    <p>They become attached to the oogonial wall or nearby cells (D)</p> Signup and view all the answers

    What is the term for the small filamentous structure that develops from an androspore?

    <p>Dwarf male plant (A)</p> Signup and view all the answers

    What is the shape of the chloroplast in Ulothrix?

    <p>Ring- or girdle-shaped (B)</p> Signup and view all the answers

    What type of flagella do the zoospores in Ulothrix have?

    <p>Either biflagellate or quadriflagellate (C)</p> Signup and view all the answers

    What is the characteristic of the life cycle of Ulothrix?

    <p>Haplontic (A)</p> Signup and view all the answers

    What is the function of the flagella in Oedogonium?

    <p>To attach to solid objects (A)</p> Signup and view all the answers

    What is the characteristic of the nucleus in Oedogonium cells?

    <p>It lies in the periphery of the cell (B)</p> Signup and view all the answers

    What is the purpose of the holdfast in Oedogonium?

    <p>To attach to a substratum (C)</p> Signup and view all the answers

    What is the characteristic of the chloroplasts in Oedogonium?

    <p>They have many pyrenoids (A)</p> Signup and view all the answers

    What is the term for the residual portions of cells that divide to bring about intercalary growth?

    <p>Caps (C)</p> Signup and view all the answers

    What is the mode of sexual reproduction in Oedogonium?

    <p>Oogamy (D)</p> Signup and view all the answers

    What is the characteristic of the filaments in Oedogonium?

    <p>They are unbranched and uniseriate (B)</p> Signup and view all the answers

    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

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    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.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser