A unicellular organism is a single-cell organism, which carries out all the activities of life. They perform all the processes of life, movement, digestion, respiration, excretion, and many others. Some common examples are Bacteria, Amoeba, Paramecium, and Euglena.
Colonial Organization: Many unicellular organisms live together in the form of colonies, each unicellular organism lives its own life, is not dependent on each other, and never forms any multicellular structure. An example is Volvox (a green alga).
Amoeba is a tiny living organism that has only one cell. It can be found in the mud of shallow ponds, pools, and any water that is not moving.
Amoeba has an irregular shape, the size is about 0.25mm.
It has a cell membrane that helps in the movement of molecules and protects the cytoplasm. The outer part of the cytoplasm is clear and transparent, called ectoplasm (gel), and the inner part is called endoplasm (sol). The cytoplasm contains a nucleus, food vacuoles, mitochondria, etc.
Amoeba moves by false foot, called pseudopodia.
Volvox is a type of green algae in the Volvocaceae family.
It forms spherical colonies of up to 50,000 cells. They live in a variety of freshwater habitats and were first reported by Antonie Van Leeuwen Hoek in 1700.
Each Volvox cell has two flagella. The flagella work together to move the body through water.
Volvox cells have chlorophyll and make their food by photosynthesis. These photosynthesis organisms are an important part of many aquatic ecosystems.
Volvox is not harmful to humans because they do not produce any toxic substance.
