How many different types of single-celled organisms are discussed in this lesson?
Amoeba: single-celled organisms that use pseudopods to move and capture food. Euglena: a single-celled organism that can move and feed on its own. Paramecium: a single-celled organism with a tail-like structure to help it swim.
An Introduction to Microscopic Organisms
amoeba: a single-celled organism that moves and eats by changing its shape and engulfing food particles euglena: a single-celled organism that can move about and contains chloroplasts which allow it to make its own food paramecium: a single-celled organism that moves using small hairs called cilia and eats by engulfing particles of food
Which of these organisms do you think is the most interesting?
Amoebas and euglenas are two of the most ancient organisms on Earth, having existed for more than 2 billion years. Paramecium is the only ciliate organism that has a single, central contractile vacuole, while other ciliates have two. Amoebas use pseudopods (false feet) to move, while euglenas and paramecia use cilia for movement.
Did you know?
What similarities and differences do you recognize between amoeba, euglena, and paramecium?
Shape: like a blob Lives: warm, fresh water Job: cycle nutrients and energy
Shape: oval with several hair-like structures (cilia) Lives: ponds or streams Job: carbon cycle, feeds on decaying plants and bacteria
Shape: like an avocado with a tail Lives: fresh water Job: producer, breaks down other organisms
What role do these organisms play in the food chain?
What did you learn about amoeba, euglena, and paramecium from this lesson?
How do these organisms relate to the larger ecosystem?