Light sensitivity in euglena is provided by the eyespot
What is meant by eyespot?
- In some one-celled organisms, the strongly pigmented eyespot, also known as stigma, serves what appears to be a light receiving role.
- Certain light-sensitive cells in the epidermis (skin) of some invertebrate species are also referred to by this word (e.g., worms, starfishes).
- The eyespot is found in the gullet, near the base of the flagellum, of the green one-celled organism Euglena (a whiplike locomotory structure).
- A sensitive region of the flagellar base is shielded from light coming from the other end of the organism by a cup-shaped mass of pigment rods.
- The organism appears to move toward the light as a result of the light-sensitive region's influence on flagellar motility.
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