single celled organisms

Single Celled Organisms

Adapted from www.micrographia.com by Ms. Shaw

• Clarifying objective: 7.L.1.1• Compare the structures and life functions of

single-celled organisms that carry out all the basic functions of life including: Euglena, Amoeba, Paramecium, and Volvox.

Things to think about:

-How do living things move?-How do living things eat?-Do all living things contain cells? Is a cell a living

thing?

What are Protozoa (of the Protist Kingdom)?

Protozoa (1st animals)

-classified by how they move.    

Autotrophs make their own food.-Photosynthetic autotrophs make their own food

using energy from light.-Chemosynthetic autotrophs do the same thing

using energy obtained from the breakdown of chemicals. Heterotrophs require food as they cannot make their own.

-by ingestion eat by consuming food.- by absorption eat by secreting digestive

enzymes outside of their bodies, then absorbing the nutrients into their bodies.

Make a chart with 4 columns and 5 rowsHow Obtains Food

How It Moves

Unique Characteristics

Euglena

Volvox

Amoeba

Paramecium

Euglena1. How the organism obtains

food:Photosynthetic

Autotroph & Heterotrophic

2. How the organism moves:by flagella

3. Any unique characteristicspigment spot (or

stigma), positive phototaxis

Flagella - A long, threadlike appendage.

 Euglena

Volvox1. How the organism obtains food:

Photosynthetic 2. How the organism moves:

colonial flagellate3. Any unique characteristics:

colony is made up of many zooids (individuals) organized in hollow ball. Some division of labor exists within colony.

Amoeba1. How the organism obtains food

Heterotrophic: uses pseudopods to feed by engulfing the prey and incorporating it into their cytoplasm.

2. How the organism movesby pseudopods (false feet) temporary extensions of the

cell - in any direction3. Any unique characteristics

Have no definite shape or form

Pseudopodia - A temporary projection of the cytoplasm of certain cells.The prey remains inside a vacuolar structure called a food vacuole within which food gets digested and absorbed

 Amoebahttp://www.micrographia.com/specbiol/protis/homamoeb/amoe0100.htm

Paramecium• 1. How the organism obtains food:– Heterotrophic

• 2. How the organism moves:–Cilia

• 3. Any unique characteristics:–has a definite shape. Their spindle-shaped

body has anterior and posterior ends, although they dart backwards or forwards very swiftly

Cilia - Microscopic hair-like projections extending from surface of cell.They act in unison to move the cell.

 Paramecium

Cilia are used for movement, feeding, or both. The cilia may occur in rows, longitudinal or spiral, or may occur in tufts.

How Obtains Food

How It Moves

Unique Characteristics

Euglena Photosynthetic Autotroph & Heterotrophic

Flagella Pigment spot (or stigma), positive phototaxis

Volvox Photosynthetic Autotroph

Colonial flagellate Colony is made up of many zooids (individuals) organized in hollow ball. Some division of labor exists within colony.

Amoeba Heterotrophic; use pseudopods to feed by engulfing the prey and incorporating it into their cytoplasm.

Pseudopods (false feet) temporary extensions of the cell - in any direction.

Have no definite shape or form.

Paramecium Heterotrophic Cilia Has a definite shape. Their spindle-shaped body has anterior and posterior ends, although they dart backwards or forwards very swiftly.

http://www.micrographia.com/specbiol/protis/homamoeb/amoe0000.htm