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What do you mean by cell? What are unicellular and multicellular organisms?
A cell is called a structural, fundamental, and biological unit of all living beings because the body of all the organisms is made up of cells.
It is a functional unit of life because all the functions of the body (physiological, biochemical, genetic, and other metabolic functions) are carried out by cells.
For example, The blood contains RBC and the primary function of this cell is to transport oxygen and carbon dioxide.
All the living organisms are made of different types of cells. Cells are the basic units or building blocks of life.
A cell performs different vital functions like respiration, digestion, reproduction, and many more to keep itself alive. The human body is made of trillions of cells.
The existing living cells are able to split themselves into two parts, thereby forming new cells. The cells' genetic material is duplicated before it undergoes splitting. Hence, new cells are formed using existing cells.
The cell is divided into two parts, on the basis of their number:
1. Unicellular organisms:
There are few organisms that are made up of a single cell such as bacteria, amoeba, paramecium, etc. and a single cell performs all the functions such as digestion, respiration, excretion. This type of organism is known as a unicellular organism.
2. Multicellular organisms:
The higher organisms like humans, plants, animals, reptiles, fishes, insects are made up of numerous cells, and these organisms show division of labor. Such organisms are known as multicellular organisms.
Each plant cell is made up of sub-cellular organelles such as vacuoles, ribosomes, mitochondria, nucleus, chloroplast, lysosomes, ER, Golgi bodies, and many more.
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