CELL THEORY


       Cell theory states that the cell is the fundamental unit of life, and that all living things are composed of one or more cells or the secreted products of those cells. All cells arise from other cells through cell division. In multicellular organisms, every cell in the organism body derives ultimately from a single cell in fertilized egg. The cell is also phenomenon of energy flow occurs in cells in processes that are part of the function known as metabolism. Finally, cells contain hereditary information which is passed from cell to cell during cell division.


Biotic Community

Biotic community refers to all the different kinds of organisms, or species, which live together and interact with one another in a region

 

Members of the Biotic Community

1.    producers     – chlorophyll-bearing organisms.


       - capable of producing their own food

 

2.    consumers – this is the group which animals, as well as plant        without chlorophyll belong.

 

- these organisms are not capable of producing food from non-living materials.

 

3.    decomposers – a special group of consumers that feed on dead things and in so doing return the substances of those dead things back to the environment.

 

Food Chain – a sequence of organisms in a biotic community each of which uses the preceding organisms in the sequence as a source of food, the ultimate of which is plant.

 

Example : banana – monkey – decomposers Food Web – several food chains interlace


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