difference between unicellular organisms and multicellular organisms

In unicellular organisms the cell leads a totally independent life. It does not depend on any other cell for any of its activity, except in cases of sexual reproduction. There is division of labour only at the organelle level since different organelles perform specific..

An organism, may be small unicellular or multicellular. Organisms have a fixed life span and organised life cycle comprising of birth, growth, maturity, old age and death. They are always derived from pre-existing ones through the mechanism of reproduction. ..

Organic Evolution - Chemical evolution resulted in the formation of life on earth about 3.8 billion years ago. The primitive cells that resulted from this process gradually gave rise to primitive forms of organisms such as bacteria, algae, fungi and protozoan. These organis..

Life originated on earth as single cells. However, thereafter there was the formation of multicellular forms of life. A look at this situation naturally rises a question- what was the need for multicellularity? A cell is an open system, constantly exchanging matter and energy. A..

Why are Organisms Composed of Cells? - All living organisms are composed of structural and functional units called cells. The body of a living organism may be composed of a single cell - as in unicellular organisms or many cells - as in multice..

Different types of tissue may together become organised into an organ for some specific function. E.g., a gland is an organ meant for secretion. In a gland there are four tissues - Epithelium (for secretion) Muscular tissue (for contraction of the gland) Conne..

Two or more individuals with identical genetic make up formed from one parent by asexual reproduction are called clones. For example, daughter plants produced by strawberry runners and whole plants produced by tissue culture are clones. Similarly, the individuals formed by budding on the same paren..

The reactions in which an atom or group of atoms in a molecule is replaced or substituted by different atoms or group of atoms are called substitution reactio..

The different kinds of micromolecules and macromolecules that we have studied so far occur in the cell dissolved in solution or as suspensions in a colloidal state. Alternatively, they may be assembled into subcellular components like cell membrane, cytoplasm and cell organelles. In..

Summary - Ecology concerns with the associations and interactions of the organisms and the environment in general. The living place or dwelling place of an organism is called habitat. Within a given habitat there exists variations or micro habitats. In a given habitat we can obs..