Which process would euglena in the process of photosynthesis?

Solution:

The process of absorbing sunlight to synthesize foods from carbon dioxide and water. An eye-spot at the front end of and detects light, and its chloroplasts (structures that contain chlorophyll) trap the sunlight, help it in photosynthesis.

Thus this is the required answer.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.