Unicellular Organisms

What are unicellular organisms?

• Living things made of multiple cells

• Living things made of a single cell

• Living things made of two cells

• Living things made of three cells

Where can unicellular organisms live?

• Only in water

• Only in soil

• Only in or on multicellular organisms

• In water, soil, and in or on multicellular organisms

How long have unicellular organisms been on Earth, according to some scientists?

• 100 million years

• 500 million years

• 1 billion years

• 3.8 billion years

What is the role of phytoplankton in the ocean?

• To convert the Sun's energy into food

• To provide most of the Oxygen in Earth's atmosphere

• To be the foundation of the Ocean food chain

• All of the above

What is the role of unicellular decomposers?

• To convert nitrogen in soil into a form that can support plant life

• To complete the cycling of matter

• To support terrestrial food chains

• All of the above

What activities do unicellular organisms perform?

• Move, eat, respond to stimuli, reproduce, and expel waste

• Move, eat, respond to stimuli, reproduce, and photosynthesize

• Move, eat, respond to stimuli, reproduce, and grow

• Move, eat, respond to stimuli, reproduce, and divide

How do paramecia move?

• By rotating a flagellum

• By changing shape and forcing cytoplasm into extensions

• By using cilia

• By swimming

How do E. coli bacteria move?

• By rotating a flagellum

• By changing shape and forcing cytoplasm into extensions

• By using cilia

• By swimming

How does an amoeba move?

• By rotating a flagellum

• By changing shape and forcing cytoplasm into extensions

• By using cilia

• By swimming

What is the size of most unicellular organisms?

• Larger than a speck of dust

• About the size of a speck of dust

• Smaller than a speck of dust

• About the size of a grain of sand