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Which of the following are free living nitrogen-fixing bacteria?
Azotobacter
Cyanobacteria
Rhizobium
Clostridium
Select the correct answer using the code given below.
- a)1 and 3 only
- b)2 only
- c)1, 2 and 4 only
- d)1, 2, 3 and 4
Correct answer is option 'C'. Can you explain this answer?
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Which of the following are free living nitrogen-fixing bacteria? Az...
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Which of the following are free living nitrogen-fixing bacteria? Az...
Explanation:
Nitrogen fixation is the process of converting atmospheric nitrogen (N2) into a usable form of nitrogen for plants and other organisms. Nitrogen-fixing bacteria play a crucial role in this process by converting nitrogen gas into ammonia that can be used by plants for their growth and development. There are various types of nitrogen-fixing bacteria, some of which are free-living and some form symbiotic associations with plants.
The given options are:
1. Azotobacter: Azotobacter is a free-living nitrogen-fixing bacterium that can be found in soil. It does not form symbiotic associations with plants and is capable of fixing atmospheric nitrogen into ammonia. Therefore, option 1 is correct.
2. Cyanobacteria: Cyanobacteria, also known as blue-green algae, are photosynthetic bacteria that can fix atmospheric nitrogen. They are free-living organisms that can be found in various aquatic and terrestrial environments. Therefore, option 2 is correct.
3. Rhizobium: Rhizobium is a nitrogen-fixing bacterium that forms a symbiotic association with leguminous plants. It establishes a mutualistic relationship with the plants, forming structures called root nodules where nitrogen fixation occurs. Therefore, option 3 is not correct as Rhizobium is not a free-living nitrogen-fixing bacterium.
4. Clostridium: Clostridium is a genus of bacteria that includes various species, some of which are capable of nitrogen fixation. However, not all species of Clostridium are nitrogen-fixing bacteria, and some are even pathogenic. Therefore, option 4 is not correct as it is too general and does not specify the nitrogen-fixing ability of the bacteria.
From the above analysis, it can be concluded that the correct answer is option 'C' - 1, 2, and 4 only.
Nitrogen fixation is the process of converting atmospheric nitrogen (N2) into a usable form of nitrogen for plants and other organisms. Nitrogen-fixing bacteria play a crucial role in this process by converting nitrogen gas into ammonia that can be used by plants for their growth and development. There are various types of nitrogen-fixing bacteria, some of which are free-living and some form symbiotic associations with plants.
The given options are:
1. Azotobacter: Azotobacter is a free-living nitrogen-fixing bacterium that can be found in soil. It does not form symbiotic associations with plants and is capable of fixing atmospheric nitrogen into ammonia. Therefore, option 1 is correct.
2. Cyanobacteria: Cyanobacteria, also known as blue-green algae, are photosynthetic bacteria that can fix atmospheric nitrogen. They are free-living organisms that can be found in various aquatic and terrestrial environments. Therefore, option 2 is correct.
3. Rhizobium: Rhizobium is a nitrogen-fixing bacterium that forms a symbiotic association with leguminous plants. It establishes a mutualistic relationship with the plants, forming structures called root nodules where nitrogen fixation occurs. Therefore, option 3 is not correct as Rhizobium is not a free-living nitrogen-fixing bacterium.
4. Clostridium: Clostridium is a genus of bacteria that includes various species, some of which are capable of nitrogen fixation. However, not all species of Clostridium are nitrogen-fixing bacteria, and some are even pathogenic. Therefore, option 4 is not correct as it is too general and does not specify the nitrogen-fixing ability of the bacteria.
From the above analysis, it can be concluded that the correct answer is option 'C' - 1, 2, and 4 only.
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Which of the following are free living nitrogen-fixing bacteria? Azotobacter Cyanobacteria Rhizobium Clostridium Select the correct answer using the code given below.a)1 and 3 onlyb)2 onlyc)1, 2 and 4 onlyd)1, 2, 3 and 4Correct answer is option 'C'. Can you explain this answer?
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