You're likely referring to the chloroplasts within Euglena. These are not rod-like, but rather oval or disk-shaped green structures.

Here's what chloroplasts allow Euglena to do:

* Photosynthesis: Chloroplasts contain chlorophyll, the pigment that allows Euglena to capture sunlight and use it to convert carbon dioxide and water into glucose (sugar) for energy. This makes Euglena mixotrophic, meaning they can produce their own food like plants but can also consume other organisms.

* Produce Oxygen: As a byproduct of photosynthesis, Euglena release oxygen into their environment.

While Euglena do have flagella (whip-like structures) for movement, these are distinct from the chloroplasts.

So, the chloroplasts are the key structures enabling Euglena to perform photosynthesis.