Movement – SS1 Biology Lesson Note (First Term)

Movement is the ability of living organisms to move from one place to another.

Behavioural objectives

By the end of the lesson, students should be able to:

• state the reasons why living organisms move;
• explain cyclosis (cytoplasmic streaming);
• name the organ or organelle of movement in Amoeba, Paramecium, Euglena, Hydra, earthworm, fishes, and toads and frogs;
• describe how each of these organisms moves.

Why do living organisms move?

1. To search for food
2. To escape from danger
3. To respond to a stimulus, either positively or negatively
4. For reproduction

What is cyclosis?

Cyclosis, also called cytoplasmic streaming, is the mass rotational streaming or movement of the cytoplasm and its contents in cells with a vacuole. In some cases, the streaming is restricted to a particular region of the cell. At other times, the whole cytoplasm moves in a circular direction within the cell.

How do different organisms move?

Evaluation

1. State four reasons why living organisms move.
2. What is cyclosis?
3. Name the organelle used for movement by Amoeba, Paramecium and Euglena.
4. How does an earthworm move, and which structures does it use?

Assignment

1. Make a table showing fishes, toads and frogs, with the organ each uses for movement and how it moves.
2. Explain how Paramecium moves through water.