Question

Are Bacteria multicellular?

Answer 1

Living organisms can be broadly classified into two types- Multicellular and Unicellular. This classification is based on the number of cells present in the organisms. Unicellular organisms are made up of only one cell. A single cell can carry out all functions of the organism. The lower organisms are usually unicellular in nature. Multicellular organisms are made up of many cells or more than one cell. Here each type of cell performs different functions.

Complete explanation:
Bacterias are one of the very first organisms to evolve on earth. They make up the large domain of prokaryotic organisms. It lacks a true nucleus and well-defined organelles. Bacteria are unicellular in nature, made up of only one cell.
Bacterias are only a few micrometres in length and their shapes vary from spheres to rods and spirals. They are present in all of the earth’s habitat including soil, water, acidic hot springs, radioactive waste and even earth's inner crust. They also live in symbiotic or parasitic relationships with other living organisms like animals and plants.
The single cell of bacteria carries out all life functions such as feeding, respiration, reproduction etc. Due to its unicellular nature, cell differentiation is absent in bacteria. Bacteria reproduce predominantly through asexual methods but sexual reproduction is also seen (i.e. conjugation).

Note:
It is known that organisms that are made of more than one cell are called multicellular organisms. Multicellular organisms are mostly constituted by eukaryotes. The multicellular organisms include all vertebrates, invertebrates, angiosperms, gymnosperms and other higher land plants. Multicellular organisms are visible to the naked eye unlike unicellular organisms which are microscopic in nature. These organisms also have specialized cell types for each function. For example, transport of water is done by xylem cells and transport of food materials is done by phloem cells in plants.