The different levels of organiation below organism level can be explained as under:

                       

 

Organization is the arrangement of smaller components of nay structure, system or situation into larger ones and larger ones into still larger ones in hierarchy, where components of each level coordinate with one another towards a common goal. Organisation is sort of hierarchy or pyramid of levels where each level is made of components of lower level and itself becomes a component of higher level.

1. ATOMIC LEVEL

The basic unit or component of organization in both living and non-living object is an atom. An atom is, of course further made of still smaller particles like electrons, protons and neutrons.

 2. MOLECULAR LEVEL

Atoms combine with one another to form molecules Examples are:

•  pure water ( H₂O)
•  sodium chloride ( NaCl – also called table salt)
•  glucose ( C₆H₁₂O₆)
•  proteins
•  carbohydrates
•  lipids

Macromolecules are large, biologically important molecules inside cells.

 3. CELLULAR LEVEL

The subcellular components coordinate their activities to produce living cells. Living beings are made of one cell (unicellular organisms) or numerous cells (multicellular organisms). Unicellular organisms are more appropriately called acellular organisms.

They are the most abundant of all the living creatures. Unicellular or acellular organisms possess protoplasmic organisation. Multicellular organisms have higher levels of organization like cellular organization (sponges), tissue organization (coelenterates),organ organization and organ system organization.

 4. TISSUE LEVEL

In multicellular organisms the cells may be similar (colonial organisms) or organized into distinct functional units called tissue. A tissue is a group of cells with similar structure performing the same function

There are four basic types of tissue found in the human body:

• Epithelial
• Connective
• Muscular
• Neural

 5. ORGAN LEVEL

Two or more tissues are organized into distinct structures called organs . Organs are specialized for performing one or more functions e.g.  pumping by heart, photosynthesis by leaves.

6. ORGAN SYSTEM LEVEL

Two or more organs coordinate their activities towards a common activity e.g. digestive system, respiratory system.

7. ORGANISMIC LEVEL OR INDIVIDUAL LEVEL

Living beings are called organisms because they possess high level of organization. They are called individuals as each organism has a distinct interact or individuality.

8. POPULATION LEVEL

All the individuals of a species found in an area where they can interact with one another is called population.

9. COMMUNITY LEVEL

The populations of different species found in an area also interact with one another . They constitute a biotic community.

10.  ECOSYSTEM LEVEL

The biotic community of an area and its abiotic environment together form an ecosystem.

11. BIOSPHERE LEVEL

All the ecosystems of the world interact further and form biosphere or livable space of the earth. An organism is, therefore, not only an individual but also a part of population, community, ecosystem and biosphere.

Biosphere has the highest level of organization. Organizations at level of individual and above are known as higher levels of organisation.

It represents ecological hierarchy. Organizations below the level of individual (organ system, organ, tissue, cell, molecules, atoms ) are called as lower level of organization.