Because it contains chlorophyll - which has green pigment in it.
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Plants and algae appear green because they contain a pigment called chlorophyll. Chlorophyll absorbs sunlight during photosynthesis, which is the process that allows plants to produce their own food. The green light is not absorbed by chlorophyll, giving plants and algae their green color.
No, Spirogyra is a filamentous green algae, not blue-green algae. Blue-green algae belong to the group cyanobacteria, which are photosynthetic bacteria that can appear blue-green in color.
Green algae appear green because they contain chlorophyll pigments, specifically chlorophyll a and b, which absorb red and blue wavelengths of light for photosynthesis while reflecting green wavelengths. This gives green algae their characteristic green color.
Green algae belong to Kingdom Protista. Green algae is a very diverse type of algae. Actually, green algae is sort of similar to plants. The green algae contain two forms of chlorophyll and capture light energy to produce sugar in similar with the plant. However, unlike the plants the green algae are aquatic. The species are named algae because they are aquatic and make their own food.
Green algae eats by sucking in nutrients