0 Which of the following pairs of bacteria is involved in two step converson of NH3 into nitrate ? (1) Azotobacter and Nitrosomonas (2) Nitrosomonas and Nitrobacter (3) Azotobacter and Achromobacter (4) Pseudomonas and Nitrobacter

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Match the lists

	I		II
(a)	Nitrosomonas	$(1)$	Denitrifying bacteria
(b)	Nitrobacter	$(2)$	Soil bacteria
(c)	Pseudomonas	$(3)$	Nitrate bacteria
(d)	Azotobacter	$(4)$	Nitrite bacteria

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Which of the following statements are correct regarding the microorganisms P, Q, R and S involved in the nitrogen cycle shown above?

(i) 'R' is Nitrosomonas bacterium that oxidises nitrites into nitrates.

(ii) 'P' is putrefying bacterium that converts nitrogen containing proteins of dead plants into ammonia.

(iii) 'S' is Pseudomonas bacterium that converts nitrate salts into free nitrogen gas.

(iv) 'Q' is Nitrobacter bacterium that converts nitrites into nitrates.

(v) 'S' is Azotobacter bacterium that fixes free nitrogen gas

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Assertion :Ammonia is converted into nitrate by soil bacteria like Nitrosomonas and Nitrobacter Reason: These nitrifying bacteria are photoautotrophs.

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Nitrosomonas, Nitrococcus and Nitrobacter are involved in the process of

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Match the columns and choose the correct answers

	I		II
a	Free living aerobic nitrogen fixers	1	Anabaena and Nostoc
b	Anaerobic nitrogen fixers	2	Pseudomonas denitrificans and Thiobacillus denitrificans
c	Nitrogen fixing cyanobacteria	3	Nitrosomonas and Nitrococcus
d	Denitrifying bacteria	4	Azotobacter and Beijerinckia
e	Nitrifying bacteria	5	Rhodospirillum

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