File Type. Compressed Zip File. Be sure that you have an application to open this After the onion, students will examine a leaf from the elodea plant. “ cytoplasmic streaming” where you will witness chloroplasts floating around and drifting. If you look closely, you can see, the cells chloroplasts moving throughout the cell. This movement is called cytoplasmic streaming. The chloroplasts are circling to. Eukaryotic cells contain membrane-bound organelles, such as the nucleus, while prokaryotic . Here is an example of Cytoplasmic Streaming in an Elodea Leaf.

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Elodea is a water plant native to Canada, often used in aquariums.

It is also often used in biology labs on cell structure because it forms nice, large cells that are easily observed under the microscope. Chloroplasts are the organelles in a plant cell that contain the chlorophyll plants use to convert light into sugars.


Chloroplasts do move in a cell. Observing chloroplasts in movement in an elodea cell is like watching a busy, bustling mass of pedestrians from a building high above. They jostle and slide and scoot around the cell, often sticking near the edges of the cell but sometimes seeming to fill the cell entirely with constant motion. The motion is common to the interior of cells and is called cyclonic or cytoplasmic streaming.

Unit 1 – Organization of Life – Ms. Warnock

This current in motion occurs in the contained liquids of the cell. The actual cause of the motion isn’t yet clear, but it does alter with heat and light and is changed by increases and decreases in fluid content.


Chloroplasts in plants have been found to display another form of motion, called chloroplast avoidance motion. It appears to be a response to light intensity.

In extreme light exposure, the chloroplasts line up steaming the blades of a Venetian blind to let the light pass through. On dim, dark days, they flip their alignment, like the Venetian blind closing, to catch what light is present.

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This appears to be a method of adjusting the amount of damage to the plant by sunlight. She graduated with honors in religious studies from UCSB. She’s currently in an M.

Fun Science Experiments on Cells. Reproduction of Plant Cells.

Cytoplasmic streaming – Wikipedia

By Peg Robinson; Updated March 13, The Three Stages of Photosynthesis. Why Do Chloroplasts Move in Elodea? Depending on which text editor you’re pasting into, you might have to add the italics to the site name. Copyright Leaf Group Ltd.