Eukaryotic Algae: Division Chlorophyta
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Questions and Answers

Which pigment primarily gives red algae their characteristic color?

  • Phycocyanin
  • Carotenoids
  • Phycoerythrin (correct)
  • Chlorophyll
  • What type of starch is primarily accumulated in the cells of red algae during photosynthesis?

  • Floridean starch (correct)
  • Lucosaccharose
  • Glycogen
  • Amylose
  • What is the primary structure of the cell walls in diatoms made of?

  • Chitin
  • Silica (correct)
  • Calcium carbonate
  • Cellulose
  • Which characteristic is NOT associated with members of the Rhodophyta?

    <p>Presence of motile ciliate cells</p> Signup and view all the answers

    What is the maximum known depth at which red algae can grow?

    <p>180m</p> Signup and view all the answers

    Which of the following best describes the reproductive method of red algae?

    <p>They exhibit both haploid and diploid stages</p> Signup and view all the answers

    What shape can red algae display?

    <p>Variety of forms including filamentous and ribbon-shaped</p> Signup and view all the answers

    What is a significant feature of diatom reproduction?

    <p>By binary fission</p> Signup and view all the answers

    What distinctive feature do the cell walls of diatoms have?

    <p>They are made of two overlapping halves similar to a Petri dish.</p> Signup and view all the answers

    Where are diatoms commonly found?

    <p>In freshwater and marine environments, as well as in wet ground</p> Signup and view all the answers

    What characterizes the chloroplasts in Chlorophyta?

    <p>They may contain pyrenoids surrounded by a starchy envelope.</p> Signup and view all the answers

    Which of the following statements about the reproduction of Chlorophyta is accurate?

    <p>Asexual reproduction can occur through motile zoospores.</p> Signup and view all the answers

    Which type of cell organization is found in coenocytic Chlorophyta?

    <p>Cells with multiple nuclei and a single large chloroplast.</p> Signup and view all the answers

    What types of organisms do chlorophytes belong to based on their motility?

    <p>Both unicellular motile and non-motile forms.</p> Signup and view all the answers

    Which of the following characteristics is NOT typical of Chlorophyta?

    <p>Cell walls primarily composed of keratin.</p> Signup and view all the answers

    In many higher forms of Chlorophyta, where are flagella typically found?

    <p>Only on zoospores and zoogametes.</p> Signup and view all the answers

    Which type of spore does NOT represent an asexual reproduction method in Chlorophyta?

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

    Which terms describe the modes of sexual reproduction in Chlorophyta?

    <p>Isogamy, anisogamy, and oogamy.</p> Signup and view all the answers

    What unique feature characterizes heterocysts in cyanophyta?

    <p>They specialize in nitrogen fixation.</p> Signup and view all the answers

    Which of the following accurately describes the reproductive method of cyanophyta?

    <p>They utilize fragmentation to form new organisms.</p> Signup and view all the answers

    What components make up the cell wall of cyanophytes?

    <p>Cellulose and pectic compounds.</p> Signup and view all the answers

    What are akinetes primarily responsible for in cyanophyta?

    <p>Surviving unfavorable conditions.</p> Signup and view all the answers

    Which of the following is true regarding the characteristics of Nostoc?

    <p>Nostoc can survive in both aquatic and terrestrial habitats.</p> Signup and view all the answers

    What distinguishes Anabaena from other cyanophytes?

    <p>It contains specialized cells for nitrogen fixation.</p> Signup and view all the answers

    Which statement accurately describes the pigment composition in cyanophyta?

    <p>Cyanophyta contains chlorophyll and phycocyanin.</p> Signup and view all the answers

    What is the nature of the protoplast in cyanophytes?

    <p>It is differentiated into chromoplasm and central body.</p> Signup and view all the answers

    In regards to their habitat, where are cyanophytes most commonly found?

    <p>In freshwater and stagnant environments.</p> Signup and view all the answers

    What role do chromoplasmic zones have in cyanophytes?

    <p>Photosynthesis.</p> Signup and view all the answers

    Study Notes

    Eukaryotic Algae Overview

    • Eukaryotic algae are classified into various divisions, including Chlorophyta (green algae), Cyanophyta (blue-green algae), Rhodophyta (red algae), and Bacillariophyta (diatoms).

    Division Chlorophyta (Green Algae)

    • Presence of chlorophyll in plastids (chloroplasts).
    • Mostly freshwater species; some are terrestrial.
    • Forms can be unicellular, colonial (motile or non-motile), multicellular (thalloid or filamentous), or coenocytic.
    • Protoplast is organized with a definite nucleus and distinct chloroplasts, often containing pyrenoids.
    • Cell walls are composed of cellulose with pectose layers; some have gelatinous sheaths.
    • Motility in unicellular/colonial forms is facilitated by flagella or cilia, usually in pairs, occasionally in larger numbers.
    • Higher forms have flagella exclusive to reproductive structures (zoospores and zoogametes).
    • Reproduction methods include:
      • Vegetative: cell division or fragmentation.
      • Asexual: via motile zoospores, non-motile aplanospores, or akinetes.
      • Sexual: can be isogamous, anisogamous, or oogamous, with some species being homothallic.

    Division Cyanophyta (Blue-Green Algae)

    • Characterized by blue-green pigment phycocyanin and chlorophyll.
    • Primarily unicellular; some form chains or colonies.
    • Found in freshwater, often in stagnant water and wet ground.
    • Cell structure is primitive without a definite nucleus; protoplast has chromoplasm (peripheral colored zone) and a central body.
    • Cell walls made of cellulose and pectic compounds; starch absent, glycogen present.
    • Common vegetative reproduction methods include cell division, colony fragmentation, and hormogonia formation.
    • Lack sexual reproduction and ciliated bodies.
    • Resting spores (akinete) develop in some filamentous forms, and heterocysts are specialized for nitrogen fixation.

    Division Rhodophyta (Red Algae)

    • Composed of specialized marine algae, widely distributed in temperate and tropical seas.
    • Found at various depths, with many species attached to rocky substrates.
    • Possess red pigment phycoerythrin, which masks chlorophyll, and some contain phycocyanin.
    • Forms can be filamentous, ribbon-shaped, or leaf-like; lengths range from a few centimeters to over a meter.
    • Accumulate floridean starch as a product of photosynthesis; motile reproductive cells and zoospores are absent.
    • Members may be haploid or alternate between haploid and diploid stages, as seen in Polysiphonia.

    Division Bacillariophyta (Diatoms)

    • Known for their beautiful, unicellular forms; occasionally form filaments and colonies.
    • Widely distributed in freshwater and saltwater, as well as wet ground.
    • Form significant populations in oceans, notably as plankton.
    • Composed of silica with cell walls that consist of two overlapping halves (epitheca and hypotheca).
    • Fossil diatoms contribute to deposits of diatomaceous earth, essential for various industrial applications.

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    Description

    Explore the fascinating world of Division Chlorophyta, or green algae, which are defined by their unique chlorophyll-containing plastids. This quiz covers their diverse forms, including unicellular, multicellular, and coenocytic structures, and their habitats, predominantly freshwater and some terrestrial. Test your understanding of these remarkable organisms!

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