Some types of dinoflagellates (single-celled eukaryotes) are photosynthetic. They have flagella and can swim through the water. If you grow them in a container that is lit from the right side, the cells will swim to the right side of the container. If the researcher turns off the light, the dinoflagellates will swim randomly about the container. Now the researcher shines the light on the left side of the container, and the dinoflagellates all swim directly to the left side of the container. This is an example of:

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This is an example of taxis, which is a directional response to a stimulus. In this case, the dinoflagellates are responding to the presence of light by swimming towards it. This is different from kinesis, which is a non-directional response to a stimulus, and classical conditioning and circadian clock, which involve learning or internal biological rhythms, respectively.

Some Types of Dinoflagellates (Single-Celled Eukaryotes) Are Photosynthetic