Here's why:

* Chloroplasts: Spirogyra is a green algae that contains chloroplasts, the organelles responsible for photosynthesis. These chloroplasts are arranged in a spiral shape, giving Spirogyra its distinctive appearance.

* Chlorophyll: The chloroplasts contain chlorophyll, the green pigment that captures light energy for photosynthesis.

* CO2 and Water: Spirogyra, like all plants, uses carbon dioxide (CO2) from the environment and water for photosynthesis.

Therefore, Spirogyra has all the necessary components to carry out photosynthesis and produce its own food.