what is levels of biological organization?

levels of biological organization

Organization of Life

You have read that cell is the basic unit of structure and function of living organisms. These organisms may be unicellular or multicellular. A unicellular (single-celled) organism like a multicellular organism is capable of performing all the functions of life. Multicellular organisms are made up of many cells. These cells are different from one another in the structure, from a function. All the cells having similar size and structure perform similar functions.

Cells Form Tissues

Similar type of cells arranges themselves in the form of groups or layers. Such a group of cells is called a tissue. All cells of a tissue perform similar function.

Tissues Form Organs

Different tissues organize to form an organ. An organ performs one or more functions in the body. Examples of different organs in the animals are heart, lungs, stomach, kidneys etc. similarly root, and stem, leaves and flowers are different organs of a plant.

Organs Form Systems

As cell forms tissues and tissues form organs, likewise organs form systems. Different systems perform one or more than one special functions.

Plants have two main systems

  1. Root system
  2. Shoot system

Human body has many systems

Digestive system

System for digestion of food.

Respiratory System

System for breathing.

Excretory System

System for removal of waste materials.

Nervous system

System to conduct the messages.

Circulatory System

System for transport of blood in the body.

Systems Form an Organism

All organisms, animals or plants are formed of different systems, which work together in coordination. For example all human systems which have been discussed above together form a human body_ an organism. Similarly a plant that is an organism is made up of root system and shoots system.

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