The _ has an eyespot
a. Diatom
b. Dinoflagellate
c. Euglena
To determine which organism among diatoms, dinoflagellates, and Euglena has an eyespot, we can break down the options and analyze them one by one.
Diatoms: Diatoms are single-celled organisms that possess a silica frustule shell. They are photoautotrophs, meaning they can perform photosynthesis. However, diatoms do not have eyespots, as they rely on pigments within chloroplasts to detect light for photosynthesis.
Dinoflagellates: Dinoflagellates are also single-celled protists, often characterized by the presence of two flagella, which help them move through water. Some dinoflagellates, particularly those belonging to the group called the Peridiniales, possess an eyespot. The eyespot allows them to detect light and helps them orient themselves towards it.
Euglena: Euglena is another single-celled, flagellated protist. They contain a chloroplast and can perform photosynthesis. Euglena also have an eyespot located at the base of their flagellum. This eyespot, which is sensitive to light, helps Euglena move towards light sources for optimal photosynthesis.
Based on this information, the correct answer is: c. Euglena