Exploring the World of Algae
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Questions and Answers

Which of the following is a characteristic of algae?

  • They occur only in marine habitats
  • They are autotrophic (correct)
  • They are heterotrophic
  • They reproduce only through sexual methods

    • Which of the following is an example of a filamentous algae?

  • Volvox
  • Ulothrix
  • Spirogyra (correct)
  • Kelp

    • How do algae reproduce vegetatively?

  • By asexual methods
  • By fusion of gametes
  • By producing spores
  • By fragmentation (correct)

    • What is the most common type of spore produced by algae?

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

    What is the term for sexual reproduction in algae where the gametes are similar in size?

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

    Which of the following is an example of anisogamous reproduction in algae?

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

    How is oogamous reproduction in algae characterized?

    <p>Fusion of two different-sized gametes</p> Signup and view all the answers

    What is the primary role of algae in the ecosystem?

    <p>To increase the level of dissolved oxygen</p> Signup and view all the answers

    Which class do algae belong to?

    <p>All of the above</p> Signup and view all the answers

    Which algae are used commercially to produce hydrocolloids?

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

    Which algae are used to grow microbes and in preparations of ice-creams and jellies?

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

    Which algae is rich in proteins and used as a food supplement even by space travellers?

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

    Which algae are among the species used as food?

    <p>All of the above</p> Signup and view all the answers

    Which algae produce algin, a water holding substance used commercially?

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

    Which algae produce carrageen, a water holding substance used commercially?

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

    Which commercial product is obtained from Gelidium and Gracilaria algae?

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

    Which commercial product is used in the preparation of ice-creams and jellies?

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

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