26. Denitrification may be distinguished as

A. dissimilative
B. assimilative
C. both (a) and (b)
D. blue baby syndrome

27. The conversion of molecular nitrogen into ammonia is known as

A. nitrification
B. denitrification
C. nitrogen fixation
D. ammonification

28. The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

A. Hydrolytic
B. Transitional
C. methanogenic
D. All of these

29. Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

A. Achromobacter
B. Agrobacterium
C. Alcaligenes
D. None of these

30. Some microorganisms have the ability to increase the nitrogen content of soils, are called as

A. nitrogen fixation
B. denitrification
C. nitrification
D. all of these