Characteristics of Amoeba
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Questions and Answers

What is the approximate size of an amoeba?

  • 0.025 mm
  • 2.5 mm
  • 0.25 mm (correct)
  • 0.25 cm

    • Which structure in an amoeba aids in its movement?

  • Pseudopod (correct)
  • Nucleus
  • Food vacuole
  • Cell membrane

    • What is the function of the cell membrane in an amoeba?

  • Stores nutrients
  • Protects the cytoplasm (correct)
  • Aids in reproduction
  • Produces energy

    • What is the outer part of the cytoplasm called?

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

    Where is amoeba commonly found?

    <p>Mud of shallow ponds</p> Signup and view all the answers

    What is the primary method by which Volvox moves in water?

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

    Which of the following is NOT a characteristic of Volvox cells?

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

    How many cells can a Volvox colony contain?

    <p>Up to 50,000 cells</p> Signup and view all the answers

    What role do chloroplasts play in Volvox cells?

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

    Volvox was first reported in 1700 by which scientist?

    <p>Antonie Van Leeuwenhoek</p> Signup and view all the answers

    Why are Volvox colonies not harmful to humans?

    <p>They do not produce any toxic substances.</p> Signup and view all the answers

    Study Notes

    Characteristics of Amoeba

    • Amoeba is a unicellular organism found in stagnant water, such as shallow ponds and pools.
    • It measures approximately 0.25mm in size and has an irregular shape.

    Cellular Structure

    • The cell membrane plays a crucial role in the movement of molecules and protects the cytoplasm.
    • The cytoplasm is divided into two parts: ectoplasm (outer, clear, and transparent) and endoplasm (inner, more granular).
    • The cytoplasm contains various organelles, including:
      • Nucleus
      • Food vacuoles
      • Mitochondria
      • Lysosomes
      • Fat droplets
      • Contractile vacuole

    Movement

    • Amoeba moves using pseudopodia, also known as false feet.

    Volvox

    • Volvox is a polyphyletic genus of chlorophyte green algae in the family Volvocaceae.
    • Forms spherical colonies of up to 50,000 cells.
    • Lives in a variety of freshwater habitats.

    History of Volvox

    • First reported by Antonie Van Leeuwen Hoek in 1700.

    Volvox Cell Structure

    • Each cell has two flagella.
    • Each cell has a contractile vacuole.
    • Each cell has an eyespot.
    • Each cell has a chloroplast.
    • Each cell has a nucleus.

    Volvox Colony Characteristics

    • Volvox cells live together in a colony.
    • Each cell has two flagella that beat together to roll the body in water.
    • Volvox cells have chlorophyll and make their own food by photosynthesis.
    • Plays an important role in many aquatic ecosystems.
    • Not harmful to humans because they do not produce any toxic substance.

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    Description

    Learn about the characteristics of amoeba, a unicellular organism found in stagnant water, including its size, shape, and cellular structure.

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