GENERAL HISTOLOGY

Detailed explanation-1: -Microscopy. Euglena are single celled organisms and thus cannot be seen with the naked eye. For this reason, a compound microscope has to be used to observe and study them.

Detailed explanation-2: -Because the Euglena can undergo photosynthesis, they detect light via eyespot and move toward it; a process known as phototaxis. When an organism responds to light, a stimus (plural, stimuli), they move either toward or away from light.

Detailed explanation-3: -Euglenas create their own food through photosynthesis, the process of absorbing sunlight to synthesize foods from carbon dioxide and water. An eyespot at the front end of the euglena detects light, and its chloroplasts (structures that contain chlorophyll) trap the sunlight, allowing photosynthesis to occur.

Detailed explanation-4: -Euglena gracilis is a unicellular organism that swims by beating a single anterior flagellum.

Detailed explanation-5: -Euglena deses is a dominant freshwater species with many morphological varieties characterizing by an elongated cylindrical cell shape, strong metaboly, numerous discoid chloroplasts with a naked pyrenoid and rod-shaped paramylon grain in the cytoplasm.