1. Presence of Chloroplasts:
* Euglena have chloroplasts, which are organelles containing chlorophyll. Chlorophyll is the green pigment that absorbs light energy for photosynthesis. You can observe chloroplasts under a microscope, appearing as green, oval structures within the Euglena.
2. Production of Oxygen:
* Like plants, Euglena release oxygen as a byproduct of photosynthesis. This can be tested by placing Euglena in a solution with an oxygen indicator (like bromothymol blue). The indicator will change color if oxygen is present, indicating photosynthesis is occurring.
3. Ability to Grow in the Light:
* Euglena thrive in light environments. They require light energy to carry out photosynthesis. In darkness, they can still survive using heterotrophic means (consuming other organisms), but they grow much slower.
4. Presence of Starch Granules:
* Euglena store excess energy from photosynthesis as starch granules, which can be observed as small, white granules within the cell under a microscope.
5. Ability to Convert Carbon Dioxide into Organic Compounds:
* Euglena can convert carbon dioxide from the environment into organic compounds like glucose, which is the hallmark of photosynthesis.
Therefore, the presence of chloroplasts, oxygen production, growth in light, starch storage, and carbon dioxide conversion to organic compounds all indicate that Euglena carry out photosynthesis.
