Question

Which of the following is an unicellular organism?
1. Amoeba 
2. Earthworm
3. Elephant 
4. Monkey

Answer 1

Correct Answer - Option 1 : Amoeba 

The correct answer is Amoeba,

 

• All living organisms are made up of one or more unit called cells.
• Organisms consist of only one cell is called a unicellular organism.
• Amoeba is an example of a unicellular organism.
• Other examples of unicellular organism are:
  • Chlamydomonas.
  • Paramoecium.
  • Bacteria.
  • Nostoc.
  • Yeast.
• Many cells group together in a single body and assume different functions in it to form various body parts in multicellular organisms.
• Examples of a multicellular organism are:
  • Plants.
  • Animals.
  • Fungi.
  • Algae.

 

• Every multi-cellular organism has come from a single cell.
• All cells come from pre-existing cells.
• If an organism has no cell, it is called acellular.
  • Virus is an example of an acellular organism.