in Microbes in Human Welfare by

1 Answer

0 votes

The main factors that influence the growth of the Azotobacter are:

  1. Temperature: It is a mesophilic bacterium which can withstand at temperature between 25°C-30°C.
  2. Humidity: The cell of the Azotobacter requires high humidity and lower intracellular osmotic pressure.
  3. Aeration: It require the continuous oxygen supply as it an aerobic bacteria. But it can also multiply in micro aerophilic conditions.
  4. Salt: The viability of the microorganisms in the soil depends on the high salt concentrations.
  5. pH: The pH has an important influence on the metabolic activity of the Azotobacter. The optimum pH for the growth of bacteria is just above the neutrality that is between 7.2 - 7.6.
Biology Questions and Answers for Grade 10, Grade 11 and Grade 12 students, Junior and Senior High Schools, Junior Colleges, Undergraduate biology programs and Medical Entrance exams.