Answer:8- All three pigments are found in Cyanobacteria.
9- Stain
10- Symbiotic
11-Small size , ability to reproduce , diverse habitats all contributes to bacterial diversity.
Explanation: 8-By the presence of different pigments Cyanobacteria shows different colors. Chlorophylll a green pigment, Phycocyanin a blue color pigment, Phycoeythrin a red color pigment.
9- Bacteria are divided into two groups gram positive and gram negative. Those who retain crystal violet stain are gram positive and the one do not retain color are gram negative.
10- Symbiotic bacteria helps cows to digest cellulose. Cows have Symbiotic bacteria in their intestinal tract.They release enzymes which help cellulose to digest.
11- Bacteria has large diversity. Small size , diverse habitat and ability to reproduce contribute to their diversity.