Plant Biology Quiz on Vaucheria and Thallus Organization
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Questions and Answers

Which of the following is true about Vaucheria?

  • It has only one type of cell division.
  • It has a smooth, non-branching system.
  • It exhibits branching systems with rhizoids. (correct)
  • It does not form reproductive organs.

    • Most tropical Siphonales are not calcified.

    False

    What type of thallus organization is characterized by cell division in more than one plane?

    Parenchymatous

    The example of tubular structure in Chlorophyceae is __________.

    <p>Enteromorpha</p> Signup and view all the answers

    Match the following organisms with their thallus organization:

    <p>Viva = Foliose Sargassum = Parenchymatous Caulerpa = Large branched siphon Codium = Intricate vesicle system</p> Signup and view all the answers

    Which of the following classes contains flagellated unicelled structures?

    <p>Euglenineae</p> Signup and view all the answers

    All members of Chlorophyceae have flagella that are unequal in size.

    <p>False</p> Signup and view all the answers

    Name a common example of a unicellular flagellated form.

    <p>Chlamydomonas</p> Signup and view all the answers

    Euglena is classified as a __________ unicellular flagellated form.

    <p>naked</p> Signup and view all the answers

    What is a notable feature of motile flagellated forms?

    <p>Presence of an eye-spot (stigma)</p> Signup and view all the answers

    Match the following unicellular forms with their characteristics:

    <p>Chlamydomonas = Flagellated unicellular green alga Diatoms = Non-flagellated with siliceous walls Synechococcus = Cyanophycean non-flagellated form Haematococcus = Encapsulated unicellular form</p> Signup and view all the answers

    All diatoms are non-motile.

    <p>False</p> Signup and view all the answers

    What type of shape can the unicellular plant body take?

    <p>Spherical, oblong, or pear-shaped</p> Signup and view all the answers

    Which of the following types of thalli are considered unicellular?

    <p>Chrysamoeba</p> Signup and view all the answers

    All algae exhibit unicellular forms except for brown algae.

    <p>True</p> Signup and view all the answers

    What is the primary characteristic of the thallus in algae?

    <p>It is not differentiated into root, stem, and leaves.</p> Signup and view all the answers

    Algae that are able to perform amoeboid movement due to cytoplasmic growth are known as __________ forms.

    <p>Amoeboid</p> Signup and view all the answers

    Match the following thallus organization types to their characteristics:

    <p>Unicellular = Motile and non-motile forms Colonial = Loose or integrated structures Filamentous = Branched or un-branched forms Siphonaceous = Multinucleate tube-like structures</p> Signup and view all the answers

    Which type of algal thallus is characterized by the absence of flagella?

    <p>Rhizopodial forms</p> Signup and view all the answers

    Siphonaceous algae have a simple thallus structure.

    <p>False</p> Signup and view all the answers

    The __________ are the motile unicellular forms of algae characterized by the presence of flagella.

    <p>Flagelloid forms</p> Signup and view all the answers

    Which of the following types of filaments is known for being free-living and un-branched?

    <p>Spirogyra</p> Signup and view all the answers

    All cells in simpler filamentous algae like Ulothrix and Spirogyra are structurally and functionally alike.

    <p>True</p> Signup and view all the answers

    Name one example of a branched filament organism.

    <p>Cladophora</p> Signup and view all the answers

    In branched filamentous structures, __________ filament is characterized by a single row of cells with a basal attaching cell.

    <p>simple</p> Signup and view all the answers

    Match the following filamentous types with their characteristics:

    <p>Spirogyra = Un-branched filament, free-living Cladophora = Branched filament, growth restricted to end-cells Oedogonium = Un-branched filament, initially attached Nostoc = Aggregated in colonies</p> Signup and view all the answers

    Which of the following types of filaments is a characteristic of some Cyanophyceae?

    <p>False-branching</p> Signup and view all the answers

    All branched filaments can be classified as either simple, heterotrichous, or pseudoparenchymatous.

    <p>True</p> Signup and view all the answers

    Heterotrichous filament structures are characterized by __________ types of growth and division.

    <p>different</p> Signup and view all the answers

    Which type of pseudoparenchymatous structure has a single colorless central axial filament?

    <p>Uniaxial construction</p> Signup and view all the answers

    Pseudoparenchymatous algae can only have a loose association of cells.

    <p>False</p> Signup and view all the answers

    Name one example of an alga that exhibits uniaxial construction.

    <p>Batrachospermum</p> Signup and view all the answers

    In siphonaceous forms like Vaucheria, a _____-like multinucleate structure is produced.

    <p>tube</p> Signup and view all the answers

    Match the following types of algae with their structural types:

    <p>Rhodophyceae = Pseudoparenchymatous Chlorophyceae = Siphonaceous Phaeophyceae = Corticated Vaucheria = Coenocyte structure</p> Signup and view all the answers

    What is a primary characteristic of the multi-axial construction?

    <p>Many filaments around a central core</p> Signup and view all the answers

    Secondary filamentous structures provide rigidity to the body of certain algae.

    <p>True</p> Signup and view all the answers

    What is the term used to describe the close association of cells in pseudoparenchymatous structures?

    <p>interweaving of filaments</p> Signup and view all the answers

    Which type of plant-body is characterized by a basal prostrate system and an erect system?

    <p>Heterotrichous</p> Signup and view all the answers

    In Heterotrichous forms, the prostrate system is always more developed than the erect system.

    <p>False</p> Signup and view all the answers

    What is the significance of rhizoidal filaments in Heterotrichous plant-bodies?

    <p>They help in anchoring the plant to the substratum.</p> Signup and view all the answers

    In many species of Ectocarpus, the body appears in a __________ type of appearance due to the reduction of the prostrate system.

    <p>crust or cushion</p> Signup and view all the answers

    Match the following plant-body types with their characteristics:

    <p>Heterotrichous = Basal and erect systems Pseudoparenchymatous = False parenchymatous appearance Ectocarpus = Crust type appearance Coleochaete = Discoid type appearance</p> Signup and view all the answers

    Which of the following describes an endophytic species based on its prostrate system?

    <p>Only the prostrate system is developed.</p> Signup and view all the answers

    Cortication increases rigidity in some members of Phaeophyceae and Rhodophyceae.

    <p>True</p> Signup and view all the answers

    Name one genus that exemplifies a Heterotrichous plant-body.

    <p>Chaetophorales</p> Signup and view all the answers

    Study Notes

    Thallus Organisation in Algae

    • Algae have a plant body called a thallus, which is not differentiated into roots, stems, and leaves.
    • Algae range in size from microscopic unicellular forms to large, complex multicellular forms like seaweeds.
    • Thallus forms include:
      • Unicellular: Motile or non-motile, found in all algae except brown algae.
      • Aggregates: Palmelloid and dendroid forms (colonial-like clusters of cells).
      • Colonial: Motile or non-motile colonies of cells, connected or aggregated.
      • Filamentous: Unbranched or branched filaments, with cells connected end-to-end.
      • Siphonaceous: Tube-like, multinucleate structures without septa.
      • Parenchymatous: Tissue-like structures with cell divisions in more than one plane.

    Unicellular Type

    • Unicellular algae are present in various algal groups except the brown algae (Phaeophyceae).
    • Unicellular forms can be amoeboid (motile) or non-motile, with motility facilitated by flagella at the anterior end.
    • Flagella number can vary from one to multiple of two.

    Unicellular Motile (Flagelloid) Forms

    • Flagellated unicellular forms are common in various algal classes (e.g., Euglenineae, Cryptophyceae, Chrysophyceae, Dinophyceae).
    • Flagella characteristics (size, number, attachment type) are important for algal classification.
    • Some algal groups (e.g., Cyanophyceae, Phaeophyceae, Rhodophyceae, Bacillariophyceae) lack flagellated vegetative cells.

    Unicellular Non-motile (Protococcoid) Forms

    • These forms lack flagella, with unicellular forms displaying diverse appearances.
    • Examples include various groups of algae: Bacillariophyceae (Diatoms), many Chlorophyceae, Cyanophyceae, Xanthophyceae, and some forms of Dinophyceae and Rhodophyceae.

    Aggregates

    • Aggregates are formed when single cells group together to form a larger mass or colony.
    • Unlike coenobia, aggregates do not have a fixed number of cells or specific shape.
    • Palmelloid and dendroid forms showcase cell aggregation in a gelatinous matrix.

    Colonial Forms

    • Colonial forms involve the aggregation of unicells into colonies; these colonies can be either motile or non-motile.
    • Motile colonies are characterized by the coordinated movement of flagellated cells, often forming plate-like (e.g., Gonium) or spherical colonies (e.g., Volvox).
    • Non-motile colonies show varying shapes for different algal groups (e.g., Hydrodictyon, Scenedesmus).

    Filamentous Forms

    • Filamentous algae consist of thread-like structures formed by the connection of cells end-to-end.
    • They can be unbranched or branched, with simple branching patterns or complex ones (e.g., heterotrichous forms with prostrate and erect systems).

    Siphonaceous Forms

    • Siphonaceous algae form multinucleate, tube-like structures without cross-walls (septa).
    • These cells can be large and may have various branching patterns.
    • Examples include Vaucheria and Botrydium.

    Parenchymatous Forms

    • Parenchymatous algae exhibit a tissue-like organization with cell divisions in multiple planes.
    • These forms often have flat, foliose, or tubular structures, with variations in cell arrangement depending on the algal species.
    • Examples include Enteromorpha, Punctaria, and Porphyra.

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    Thallus Organisation in Algae PDF

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    Test your knowledge on Vaucheria and the different types of thallus organization in plant biology. This quiz includes statements about Siphonales and questions relating to organisms from Chlorophyceae. Challenge yourself with matching organisms to their correct thallus organization.

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