When viewing the euglena in lab, you should be able to positively identify the chloroplast and stigma.
Chloroplast is the cell organelle present in photosynthesizing organisms. These organisms are: plants, some bacteria and some fungi. It is a double membranous organelle that consists of the green colored pigment called chlorophyll.
Stigma is a photoreceptive organelle in the euglena present at the base of the reservoir. It is also called the red eyespot. The role of stigma is to focus the light upon the paraflagellar body. This helps the euglena to perform phototaxis, a phenomenon of movement of the body in response to light.
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