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Select the correct match |{:(A.,"Nitro...

Select the correct match
`|{:(A.,"Nitrosomonas",-,"Nitrite to nitrate"),(B.,"Thiobacillus",-,"Denitrification"),(C.,"Nostoc",-,"Free-living nitrogen-fixer"),(D.,"Azotobacter",-,"Anaerobic nitrogen-fixer"):}|`

A

(a)-(ii), (b)-(iv),(c )-(iii),(d)-(i)

B

(a)-(iii),(b)-(iv),(c )-(ii),(d)-(i)

C

(a)-(iv),(b)-(ii),(c )-(i),(d)-(iii)

D

(a)-(i),(b)-(ii),( c)-(iii),(d)-(iv)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question of matching the organisms with their respective functions, we will analyze each option step by step. ### Step 1: Analyze Option A - Nitrosomonas - **Function**: Nitrosomonas is known for converting ammonia to nitrite. - **Match**: The statement “Nitrite to nitrate” is actually the function of Nitrobacter, not Nitrosomonas. - **Conclusion**: This option is incorrect. ### Step 2: Analyze Option B - Thiobacillus - **Function**: Thiobacillus is involved in the process of denitrification, which is the conversion of nitrates to nitrogen gas. - **Match**: The statement “Denitrification” is correct for Thiobacillus. - **Conclusion**: This option is correct. ### Step 3: Analyze Option C - Nostoc - **Function**: Nostoc is a cyanobacterium that is capable of fixing nitrogen in a free-living state. - **Match**: The statement “Free-living nitrogen-fixer” is accurate for Nostoc. - **Conclusion**: This option is correct. ### Step 4: Analyze Option D - Azotobacter - **Function**: Azotobacter is known as an aerobic nitrogen-fixing bacterium. - **Match**: The statement “Anaerobic nitrogen-fixer” is incorrect as Azotobacter is aerobic. - **Conclusion**: This option is incorrect. ### Final Conclusion From the analysis: - Option A is incorrect. - Option B is correct. - Option C is correct. - Option D is incorrect. Thus, the correct matches are: - **Option B**: Thiobacillus - Denitrification - **Option C**: Nostoc - Free-living nitrogen-fixer
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Assertion: Reduction of nitrogen to ammonia by living organisms is called nitrification. Reason: Example of free-living nitrogen fixing anaerobic microbes are Azotobacter and Bijerinckia.