single celled organisms Protista single celled organisms

Euglena Microscopic, one-celled organisms 150 species of Euglena live in fresh water, and are especially common in warm seasons Spindle-shaped bodies 0.025 to 0.254 millimeters. Chloroplast Flagellum

Euglena Green because they contain chlorophyll which allows them to produce food through photosynthesis Some species also eat tiny particles of living matter. Use a flagellum (a whip like appendage) that sticks out from the body, to move Reproduce rapidly and can be studied under an ordinary microscope.

Why is Euglena not a plant or animal? Euglena has chloroplast which means it cannot be an animal and it has a flagellum and an eye spot which means it cannot be a plant. Chloroplasts enable cells to make their own food so this is a feature of plant cells but euglena can detect light with the eye spot and move towards it with the flagellum and no plants can do this.

Amoeba Large single celled organisms move by cytoplasmic streaming - a pseudopod projects forward and the cytoplasm flows into it they engulf small food particles and smaller cells

Amoeba Engulfs food and water particles pinocytosis is the engulfment of liquid droplets phagocytosis is the engulfment of larger food particles the amoeba does this by forming false feet that flow around the object white blood cells do the same thing

Amoeba

Paramecium Single celled organism that can be seen under a microscope Lives in fresh water so needs a contractile vacuole Moves by cilia rhythmically beating Oral groove that is used to take in food particles