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The Fundamental Unit of Life — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceThe Fundamental Unit of Life4 Marks
Question
Unicellular organisms differ from multicellular ones. How?
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Answer

Unicellular Organisms
Multicellular Organisms
The body of the unicellular organism is composed of a single cell.
The body of the multicellular organism is composed of numerous cells.
Irregular in shape.
Have a definite shape.
Simple body organization.
Complex body organization.
A single cell is responsible to carry the life processes.
Different cells are specialized to perform different functions.
The total cell body is exposed to the environment.
Only the outer cells are exposed to the environment.
Division of labour is at the organelle level.
Division of labour is at cellular, tissue, organs and organ system level.
Includes both eukaryotes and prokaryotes.
Includes only eukaryotes.
A lifespan of a unicellular organism is usually short.
These multicellular organisms have a longer lifespan.
Injury to the cell leads to the death of the organism.
Injury to a cell does not cause the cell to die in a multicellular organism.
Reproduce by asexual reproduction.
Reproduce by sexual reproduction.
Cell differentiation is absent.
Cell differentiation is obvious.
They can be autotrophs or heterotrophs.
They include both autotrophs and heterotrophs.
They are microscopic in nature.
They are macroscopic in nature.
All forms of bacteria, amoeba, paramecium yeast, are examples of unicellular organisms.
Human beings, animals, plants, birds, insects, are a few examples of multicellular organisms.
 

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