Which unicellular organism has a whip-like structure at one end of the cell and binary fission occurs in a definite orientation in relation to these structures?

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  1. Plasmodium
  2. Leishmania
  3. Amoeba
  4. Yeast

Answer (Detailed Solution Below)

Option 2 : Leishmania
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The correct answer is Leishmania.

Key Points

  • Leishmania is a genus of protozoan parasites that has a whip-like structure called a flagellum at one end of the cell.
  • These flagella are crucial for the motility of the organism, aiding in its movement and infection processes.
  • Binary fission in Leishmania occurs in a specific orientation, ensuring that the division is coordinated with the position of the flagellum.
  • The presence of flagella and orientation-specific binary fission are key characteristics that distinguish Leishmania from other unicellular organisms.

Additional Information

  • Flagellum
    • A flagellum is a long, whip-like structure that protrudes from the cell body and is used for locomotion and sensory functions.
    • In many protozoa, flagella are vital for movement, allowing them to swim through liquid environments.
  • Binary Fission
    • Binary fission is an asexual mode of reproduction common among unicellular organisms.
    • During binary fission, the parent cell divides into two equal-sized daughter cells.
  • Leishmaniasis
    • Leishmaniasis is a disease caused by infection with Leishmania parasites, which are spread by the bite of infected sandflies.
    • It can cause skin sores, fever, and damage to the spleen and liver.
  • Protozoa
    • Protozoa are a diverse group of unicellular eukaryotic organisms.
    • They can be free-living or parasitic and are found in various aquatic environments and soil.
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