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  • Question
  • Protozoa have several types of vacuoles.The function of a contractile vacuole is to


  • Options
  • A. maintain osmotic balance by continuous water expulsion
  • B. creates sites of food digestion
  • C. contain specific enzymes that perform various functions
  • D. have sites for photosynthesis

  • Correct Answer
  • maintain osmotic balance by continuous water expulsion 


  • Protozon problems


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    • 1. Sexual reproduction in the Protozoa occurs most commonly by

    • Options
    • A. conjugation
    • B. gametangial contact
    • C. binary fission
    • D. binary fusion
    • Discuss
    • 2. Which of the following is not true of protozoa?

    • Options
    • A. Lack cell wall
    • B. Produce no sporebearing structures
    • C. Comprise the microbial population known as phytoplankton
    • D. Form active feeding forms called trophozoites
    • Discuss
    • 3. Which of the following is not a function of cysts for Protozoa?

    • Options
    • A. Protect against adverse environments
    • B. Sites for nuclear reorganization and cell division
    • C. Serve as a means of transfer between hosts in parasitic species
    • D. All of the above
    • Discuss
    • 4. Members of the Protozoa may motile by all of the following methods except

    • Options
    • A. flagella
    • B. gliding by slime secretion
    • C. cilia
    • D. pseudopodia
    • Discuss
    • 5. The transport medium for Vibrio cholerae can be

    • Options
    • A. Venkatraman-Ramakrishnan medium
    • B. Selenite F broth
    • C. Tetrathionate broth
    • D. Nutrient broth
    • Discuss
    • 6. Organisms with complex life cycles which include a mammalian host and an insect host and involves schizogony as part of the cycle belong to which phylum of Protozoa?

    • Options
    • A. Sarcomastigophora
    • B. Microspora
    • C. Apicomplexa
    • D. Myxozoa
    • Discuss
    • 7. Holozoic nutrition is characterized by

    • Options
    • A. phagocytosis of solid nutrients and subsequent formation of phagocytic vacuoles
    • B. pinocytosis of solid nutrients and subsequent formation of phagocytic vacuoles
    • C. phagocytosis of soluble nutrients and subsequent formation of phagocytic vacuoles
    • D. photosynthesis
    • Discuss
    • 8. Members of which phylum of Protozoa are being considered as biological control agents for certain insects?

    • Options
    • A. Microspora
    • B. Sarcomastigophora
    • C. Apicomplexa
    • D. all of these
    • Discuss
    • 9. Protozoa are generally not

    • Options
    • A. multicellular
    • B. microscopic
    • C. lacking cell walls
    • D. eukaryotic
    • Discuss
    • 10. Most commonly asexual reproduction in the Protozoa is by

    • Options
    • A. conjugation
    • B. gametangial contact
    • C. binary fission
    • D. binary fusion
    • Discuss


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