The diagnostic features of green algae are;
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Green algae may be of different forms like unicellular, multicellular, colonial or coenocytic.
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It contains cellulosic cell wall and membrane bound chloroplast.
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The main photosynthetic pigments are Chlorophyll a, Chlorophyll b, Carotenes and Xanthophyll.
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The presence of protein bodies surrounding starch which is known as pyrenoids are present.
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Food stored in the form of starch.
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The asexual reproduction occurs by formation of different spores like Zoospore, Aplanospores, Hypnospores and Akinetes.
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The sexual reproduction occurs by isogamy, anisogamy and oogamy.