Answer:
Different pigments.
Step-by-step explanation:
Bacteria are the prokaryotic organisms that lacks the well developed nucleus. The endomembrane system is absent in bacteria and less cell organelle is present as compared with eukaryotic organism.
The bacteria are of different shape, size and colors. The colors of bacteria depend upon the type of pigment present in their body and the different wavelength of lights are absorbed by them. Pseudomonas contains the green color pigment pyoverdin and a blue pigment pyocyanin.
Thus, the answer is different pigments.