Azotobacter is a free-living bacterium that increases the yield of paddy in the soil. It is known for its ability to fix atmospheric nitrogen into ammonia, which enriches the soil and provides a valuable nutrient source for paddy plants. This process helps to improve soil fertility and enhances cropRead more
Azotobacter is a free-living bacterium that increases the yield of paddy in the soil. It is known for its ability to fix atmospheric nitrogen into ammonia, which enriches the soil and provides a valuable nutrient source for paddy plants. This process helps to improve soil fertility and enhances crop growth and yield. Unlike Rhizobium, which forms symbiotic relationships with legumes, Azotobacter does not require a plant host and can thrive independently in the soil. Acetobacter is known for its role in the production of acetic acid and is not directly related to paddy cultivation. Anabaena is a genus of cyanobacteria that can also fix nitrogen but is more commonly associated with aquatic environments rather than soil. Therefore, Azotobacter is the most effective free-living bacteria for increasing paddy yield in soil.
Tuberculosis is caused by bacteria. Specifically, it is caused by the bacterium Mycobacterium tuberculosis. This disease primarily affects the lungs but can also impact other parts of the body. Symptoms of tuberculosis include a persistent cough, chest pain, fever, and night sweats. The disease is tRead more
Tuberculosis is caused by bacteria. Specifically, it is caused by the bacterium Mycobacterium tuberculosis. This disease primarily affects the lungs but can also impact other parts of the body. Symptoms of tuberculosis include a persistent cough, chest pain, fever, and night sweats. The disease is transmitted through the air when an infected person coughs or sneezes. Early diagnosis and appropriate antibiotic treatment are crucial for managing tuberculosis and preventing its spread. Jaundice is a symptom rather than a disease and can result from various underlying conditions, including liver disease. Smallpox is caused by the variola virus, and mumps is caused by the mumps virus. Both of these viral diseases have largely been controlled through vaccination programs. Therefore, of the options provided, only tuberculosis is caused by bacteria.
Leghemoglobin plays a crucial role in nitrogen fixation by absorbing oxygen. It is a protein found in the root nodules of leguminous plants that forms a complex with oxygen, similar to the function of hemoglobin in animal blood. By absorbing oxygen, leghemoglobin maintains a low-oxygen environment iRead more
Leghemoglobin plays a crucial role in nitrogen fixation by absorbing oxygen. It is a protein found in the root nodules of leguminous plants that forms a complex with oxygen, similar to the function of hemoglobin in animal blood. By absorbing oxygen, leghemoglobin maintains a low-oxygen environment in the root nodules, which is essential for the nitrogen-fixing enzyme nitrogenase to function effectively. Nitrogenase is sensitive to oxygen and cannot operate efficiently in its presence. By keeping oxygen levels low, leghemoglobin ensures that nitrogenase can fix atmospheric nitrogen into ammonia, which the plant uses for growth. This process is vital for the plant’s nutrition and contributes to soil fertility. Additionally, the presence of leghemoglobin gives the root nodules a red or pink color, indicating active nitrogen fixation.
Beans are helpful in nitrogen fixation. They belong to the legume family, which forms a symbiotic relationship with nitrogen-fixing bacteria such as Rhizobium in their root nodules. These bacteria convert atmospheric nitrogen into ammonia, a form of nitrogen that the plant can use for growth. This pRead more
Beans are helpful in nitrogen fixation. They belong to the legume family, which forms a symbiotic relationship with nitrogen-fixing bacteria such as Rhizobium in their root nodules. These bacteria convert atmospheric nitrogen into ammonia, a form of nitrogen that the plant can use for growth. This process enriches the soil with nitrogen, benefiting both the legume crop and subsequent crops grown in the same soil. By improving soil fertility, beans play a vital role in sustainable agriculture and crop rotation practices. The ability of beans to fix nitrogen reduces the need for synthetic nitrogen fertilizers, promoting more environmentally friendly farming methods. In contrast, rice, wheat, and corn do not have the same nitrogen-fixing abilities as beans. Therefore, beans are an excellent choice for enhancing soil health and supporting agricultural productivity.
If one bacterial cell divides every 20 minutes, then in two hours (which is equal to 120 minutes), it will divide a total of six times. This is calculated by dividing the total time (120 minutes) by the time it takes for one division (20 minutes): 120 / 20 = 6 divisions. Each division doubles the nuRead more
If one bacterial cell divides every 20 minutes, then in two hours (which is equal to 120 minutes), it will divide a total of six times. This is calculated by dividing the total time (120 minutes) by the time it takes for one division (20 minutes): 120 / 20 = 6 divisions.
Each division doubles the number of bacteria. Starting with one bacterial cell, the first division produces two cells, the second division produces four cells, the third division produces eight cells, the fourth division produces sixteen cells, the fifth division produces thirty-two cells, and the sixth division produces sixty-four cells.
Therefore, in two hours, one bacterial cell will form 64 bacteria. The correct answer is [D] 64.
Which is the free-living bacteria that increases the yield of paddy in the soil?
Azotobacter is a free-living bacterium that increases the yield of paddy in the soil. It is known for its ability to fix atmospheric nitrogen into ammonia, which enriches the soil and provides a valuable nutrient source for paddy plants. This process helps to improve soil fertility and enhances cropRead more
Azotobacter is a free-living bacterium that increases the yield of paddy in the soil. It is known for its ability to fix atmospheric nitrogen into ammonia, which enriches the soil and provides a valuable nutrient source for paddy plants. This process helps to improve soil fertility and enhances crop growth and yield. Unlike Rhizobium, which forms symbiotic relationships with legumes, Azotobacter does not require a plant host and can thrive independently in the soil. Acetobacter is known for its role in the production of acetic acid and is not directly related to paddy cultivation. Anabaena is a genus of cyanobacteria that can also fix nitrogen but is more commonly associated with aquatic environments rather than soil. Therefore, Azotobacter is the most effective free-living bacteria for increasing paddy yield in soil.
See lessWhich of the following diseases is caused by bacteria?
Tuberculosis is caused by bacteria. Specifically, it is caused by the bacterium Mycobacterium tuberculosis. This disease primarily affects the lungs but can also impact other parts of the body. Symptoms of tuberculosis include a persistent cough, chest pain, fever, and night sweats. The disease is tRead more
Tuberculosis is caused by bacteria. Specifically, it is caused by the bacterium Mycobacterium tuberculosis. This disease primarily affects the lungs but can also impact other parts of the body. Symptoms of tuberculosis include a persistent cough, chest pain, fever, and night sweats. The disease is transmitted through the air when an infected person coughs or sneezes. Early diagnosis and appropriate antibiotic treatment are crucial for managing tuberculosis and preventing its spread. Jaundice is a symptom rather than a disease and can result from various underlying conditions, including liver disease. Smallpox is caused by the variola virus, and mumps is caused by the mumps virus. Both of these viral diseases have largely been controlled through vaccination programs. Therefore, of the options provided, only tuberculosis is caused by bacteria.
See lessWhat is the function of Leghemoglobin in nitrogen fixation?
Leghemoglobin plays a crucial role in nitrogen fixation by absorbing oxygen. It is a protein found in the root nodules of leguminous plants that forms a complex with oxygen, similar to the function of hemoglobin in animal blood. By absorbing oxygen, leghemoglobin maintains a low-oxygen environment iRead more
Leghemoglobin plays a crucial role in nitrogen fixation by absorbing oxygen. It is a protein found in the root nodules of leguminous plants that forms a complex with oxygen, similar to the function of hemoglobin in animal blood. By absorbing oxygen, leghemoglobin maintains a low-oxygen environment in the root nodules, which is essential for the nitrogen-fixing enzyme nitrogenase to function effectively. Nitrogenase is sensitive to oxygen and cannot operate efficiently in its presence. By keeping oxygen levels low, leghemoglobin ensures that nitrogenase can fix atmospheric nitrogen into ammonia, which the plant uses for growth. This process is vital for the plant’s nutrition and contributes to soil fertility. Additionally, the presence of leghemoglobin gives the root nodules a red or pink color, indicating active nitrogen fixation.
See lessWhich of the following crops is helpful in nitrogen fixation?
Beans are helpful in nitrogen fixation. They belong to the legume family, which forms a symbiotic relationship with nitrogen-fixing bacteria such as Rhizobium in their root nodules. These bacteria convert atmospheric nitrogen into ammonia, a form of nitrogen that the plant can use for growth. This pRead more
Beans are helpful in nitrogen fixation. They belong to the legume family, which forms a symbiotic relationship with nitrogen-fixing bacteria such as Rhizobium in their root nodules. These bacteria convert atmospheric nitrogen into ammonia, a form of nitrogen that the plant can use for growth. This process enriches the soil with nitrogen, benefiting both the legume crop and subsequent crops grown in the same soil. By improving soil fertility, beans play a vital role in sustainable agriculture and crop rotation practices. The ability of beans to fix nitrogen reduces the need for synthetic nitrogen fertilizers, promoting more environmentally friendly farming methods. In contrast, rice, wheat, and corn do not have the same nitrogen-fixing abilities as beans. Therefore, beans are an excellent choice for enhancing soil health and supporting agricultural productivity.
See lessIf one bacterial cell divides every 20 minutes, then how many bacteria will be formed from the bacteria in two hours?
If one bacterial cell divides every 20 minutes, then in two hours (which is equal to 120 minutes), it will divide a total of six times. This is calculated by dividing the total time (120 minutes) by the time it takes for one division (20 minutes): 120 / 20 = 6 divisions. Each division doubles the nuRead more
If one bacterial cell divides every 20 minutes, then in two hours (which is equal to 120 minutes), it will divide a total of six times. This is calculated by dividing the total time (120 minutes) by the time it takes for one division (20 minutes): 120 / 20 = 6 divisions.
Each division doubles the number of bacteria. Starting with one bacterial cell, the first division produces two cells, the second division produces four cells, the third division produces eight cells, the fourth division produces sixteen cells, the fifth division produces thirty-two cells, and the sixth division produces sixty-four cells.
Therefore, in two hours, one bacterial cell will form 64 bacteria. The correct answer is [D] 64.
See less