Single-celled Organism

How does single-celled organisms function.

1. SINGLE-CELL ORGANISMSINGLE-CELL ORGANISM
General IdeaGeneral Idea
In single-celled organisms, all life processes are In single-celled organisms, all life processes are
carried out in just one cell.carried out in just one cell.

2. GETTING FOODGETTING FOOD
All organisms need energy.All organisms need energy.
Others take in or eat food from the Others take in or eat food from the
outside.outside.
Single-celled organisms get food in Single-celled organisms get food in
different ways. In some the membrane different ways. In some the membrane
forms a sac, or vacuole, around the food.forms a sac, or vacuole, around the food.

3. DIFFUSIONDIFFUSION
Some materials move directly through the Some materials move directly through the
organism's cell membrane.organism's cell membrane.
One of the most important substances One of the most important substances
that passes through the cell membrane is that passes through the cell membrane is
water.water.
Some single-celled organisms also use the Some single-celled organisms also use the
vacuoles to remove excess water.vacuoles to remove excess water.

4. MOVEMENTMOVEMENT
Some single-celled organisms are able to Some single-celled organisms are able to
move from place to place.move from place to place.

5. REPRODUCTION OF SINGLE REPRODUCTION OF SINGLE
CELLED ORGANISMCELLED ORGANISM
Organisms must produce more of their Organisms must produce more of their
kind if the species is to survive.kind if the species is to survive.
One form of reproduction is binary fission.One form of reproduction is binary fission.
Other form of reproduction is budding.Other form of reproduction is budding.

6. Amoeba, Euglena, ParameciumAmoeba, Euglena, Paramecium
An amoeba takes in food by surrounding it An amoeba takes in food by surrounding it
with a membrane sac.with a membrane sac.
Most euglenas are green, single-celled Most euglenas are green, single-celled
organisms that live in ponds.organisms that live in ponds.