Photosynthesis mainly occurs in green plants, but it can also occur in other organisms such as algae and some species of bacteria. The reason that these organisms don't turn green is that they have different pigments that absorb light more efficiently than chlorophyll.

Chlorophyll is the main pigment responsible for photosynthesis in green plants, but it is not the only pigment involved. There are other pigments such as carotenes and phycobilins that also play a role in capturing light energy. These pigments have different colors, such as orange, yellow, and red, which give plants their characteristic autumn colors.

In algae, photosynthesis is carried out by different pigments such as chlorophyll a and b, phycocyanin, and phycoerythrin. These pigments are not green, but instead absorb light in different parts of the spectrum, allowing the algae to capture more energy from the sun.

In summary, photosynthesis can occur in organisms of different colors, but green is the most common color due to the abundance of chlorophyll.
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