While the majority of photosynthetic organisms are green plants, there are some non-green plants that can also perform photosynthesis.

For example, some red and purple algae, as well as some bacteria, are capable of photosynthesis. In these organisms, the photosynthetic pigments responsible for capturing light energy are different from those found in green plants. Rather than chlorophyll, they use pigments such as phycobilins and carotenoids to absorb light.

So why don't these non-green photosynthetic organisms turn green? The answer lies in the nature of the pigments they use. Chlorophyll, the pigment responsible for the green color of plants, is not the only pigment capable of capturing light energy. Different pigments absorb different wavelengths of light, which is why non-green photosynthetic organisms often have a different color.

Additionally, the color of an organism is determined not only by its pigments, but also by its structural features. For example, some plants have red or purple leaves due to the presence of anthocyanin pigments, which are not involved in photosynthesis. Therefore, even if a non-green photosynthetic organism were to produce chlorophyll, it may not necessarily turn green due to other pigments and structural features that affect its color.
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