yes they do.
Yes, Pseudomonas bacteria can emit a distinct smell, often described as a sweet or fruity odor.
oxygen
Bacteria that need oxygen to survive are called aerobic bacteria.
Anaerobic bacteria do not require oxygen to grow. Examples of anaerobic bacteria include Clostridium and Bacteroides species. These bacteria can survive and grow in environments with little to no oxygen.
Bacteria that must have oxygen to survive are called obligate aerobes. Some bacteria can live with or without oxygen and are called facultative anaerobes.Anaerobes = No oxygenAerobes = Oxygen
Bacteria do not breathe in the sense that we do, but many do require oxygen. These are called aerobic bacteria. Some bacteria will use oxygen if it is present, but can function without it. These are called facultative anaerobes. Still other bacteria will die if exposed to oxygen. These are called obligate anaerobes.
Aerobic bacteria must have oxygen to live.
Bacteria that can live in oxygen are known as aerobic bacteria. Some examples include Escherichia coli, Bacillus subtilis, and Pseudomonas aeruginosa. These bacteria use oxygen for their metabolism and growth.
Obligate aerobes require oxygen to survive. These bacteria rely on oxygen for their energy production and metabolism. Without oxygen, they are unable to grow.
Aerobic bacteria uses oxygen for cellular respiration and anaerobic bacteria doesn't require oxygen to survive. ˇ_ˇ 
No, bacteria do not always require oxygen to grow. Some bacteria are able to grow and thrive in environments without oxygen, a process known as anaerobic growth.
aerobic bacteria use oxygen based respiration, anaerobic bacteria use either nonoxygen based respiration (e.g. nitrogen, sulfur) or fermentation.