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Unicellular Organisms. What is a unicellular organism?. Any life form that consists of a single cell. They can move, digest food, and reproduce. Euglena. Environment: Ponds or puddles with rich organic matter. Movement: By flagella Important Structures: Cell Membrane

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What is a unicellular organism
What is a unicellular organism?

  • Any life form that consists of a single cell.

  • They can move, digest food, and reproduce.


Euglena
Euglena

  • Environment: Ponds or puddles with rich organic matter.

  • Movement: By flagella

  • Important Structures:

    • Cell Membrane

    • Nucleus: controls cell activities and contains DNA

    • Flagellum: helps to move

    • Chloroplast: helps with photosynthesis

    • Contractile Vacuole: removes excess water

    • Cytoplasm

  • Food: They make their own food or absorb food from their environment.


Euglena1
Euglena

  • Chloroplasts help to make their own food by photosynthesis.

  • Can absorb food from their environment.

  • This means they are considered heterotrophic (consume food) and autotrophic (make food).



Amoeba
Amoeba

  • Environment: Mud at the bottom of freshwater ponds.

  • Movement: They change shapes which allows them to move (called shape shifters).

  • Important Structures:

    • Cytoplasm: carries out chemical reactions

    • Nucleus: controls the cell

    • Cell Membrane: allows substances to enter and exit the cell

    • Food Vacuole: digests food

    • Contractile Vacuole: gets rid of excess water

    • Pseudopodium: what allows it to move over mud (false foot)

  • Capturing Prey: They surround their prey and engulf it.


Amoeba1
Amoeba

  • Some are considered parasites.

  • They reproduce asexually by splitting into two parts (fission).

  • They eat: algae, bacteria, plant cells, and other unicellular organisms.



Volvox
Volvox

  • Environment: ponds, ditches, shallow puddles

  • Movement: They beat flagella which allows it to swim.

  • Important Structures:

    • Daughter colonies

    • Flagella: helps to move

    • Chloroplast: contains chlorophyll

  • Food: makes its own food by photosynthesis.


Volvox1
Volvox

  • Daughter colonies mature and the Volvox bursts open to release them.



Paramecium
Paramecium

  • Environment: Fresh water or stagnant water

  • Movement: Cilia bend and straighten helping propel the paramecium through water

  • Important Structures:

    • Contractile Vacuoles (2): removes excess water

    • Cytoplasm: water absorption

    • Cilia: hair-like projections that propel it through water

    • Nucleus: controls cell activities

  • Food: uses cilia to sweep the food into the cell.


Paramecium1
Paramecium

  • They fire trichocysts at predators to defend themselves. Trichocysts sting the predator.

  • They can move backward when they bump into something.

  • They feed on bacteria, algae, and yeast through the cilia.

  • They reproduce by splitting in two (fission).

  • Algae live in the cytoplasm of a paramecium.



Citations
Citations

  • Paramecium Pics:

    • infovisual.info

    • goscienceseven.com

    • microscope-microscope.org

  • Amoeba Pics:

    • enchantedlearning.com

    • microscopy-uk.org.uk

    • leavingbio.net

  • VolvoxPics:

    • morning-earth.org

    • rkm.com.au

    • volvoxaureus.com

  • Euglena Pics:

    • infovisual.info

    • fcps.edu

    • schursastrophotography.com


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