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Science PT3 Chapter 2 Cell as the Basic Unit of Life
Unicellular Organisms and Multicellular Organisms
Table 2.2 Unicellular and multicellular organisms
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Unicellular Organisms Multicellular Organisms
1. Unicellular organisms are organisms that 1. Multicellular organisms are organisms that
consist of only one cell. consist of many cells.
2. These organisms are also known as 2. There are some multicellular organisms that
microorganisms because they are very small are also known as microorganisms such as:
and can only be seen using a microscope.
3. These microorganisms can behave like
plants or animals or even both.
4. Examples of unicellular organisms: Form 1

Hydra sp. Spirogyra sp. Mucor sp.
Form 1
3. Other multicellular organisms consist of
Paramecium sp. Amoeba sp. millions of cells with different shapes, sizes
and functions.
4. Examples of multicellular organisms are
mammals, reptiles, amphibians, birds, fish,
Chlamydomonas sp. Euglena sp. Yeast ferns, algae and flowering plants.

INFO CORNER

Organisms are living things that can carry out life processes such as reproduction,
growth, respiration, digestion and excretion.

Formation of an Organism
1. A multicellular organism like a human is made up of millions of cells as the basic
unit.
2. Specific cells of the same kind then work together to form tissues for carrying
out certain functions.
3. The combination of a few different groups of tissues forms organs.
4. A group of organs that work together to carry out a certain function will form a
system.
5. The organisation of cells, tissues, organs and systems form a complete organism.

Cell Tissue Organ System Organism

Quiz
Quiz
Quiz
Quiz
Human stomach
is made up of only
smooth muscle cells.
True or False?
Muscle cell Smooth muscle Stomach Digestive Human
tissue system Answer: False
Diagram 2.5 Organisation of cells in humans

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