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Mark the correct statements-
(1) mycoplasma and N2- fixation bacteria both thrive for anaerobic condition
(2) nitrogenase enzyme and PSII absent in heterocyst of nostoc
How many statements are correct -
- a)only 2
- b)both 1 and 2
- c)only 1
- d)neither 1 and nor 2
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Mark the correctstatements-(1) mycoplasma and N2- fixation bacteria bo...
Yes correct answer is C because of heterocyst of nostoc is working for nitrogen fixation by nitrogenase enzymes so option 2 is incorrect
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Mark the correctstatements-(1) mycoplasma and N2- fixation bacteria bo...
Explanation:
Statement 1: Mycoplasma and N2-fixation bacteria both thrive in anaerobic conditions.
This statement is incorrect. Mycoplasma is a type of bacteria that does not have a cell wall and can survive in a wide range of environments, including both aerobic and anaerobic conditions. On the other hand, nitrogen-fixing bacteria, which include species like Rhizobium and Azotobacter, require aerobic conditions for their growth and nitrogen fixation process. These bacteria use oxygen as a cofactor for the nitrogenase enzyme, which is responsible for converting atmospheric nitrogen (N2) into a usable form for plants.
Statement 2: Nitrogenase enzyme and PSII are absent in heterocysts of Nostoc.
This statement is correct. Heterocysts are specialized cells found in filamentous cyanobacteria like Nostoc. They are involved in nitrogen fixation, a process that requires anaerobic conditions because oxygen inhibits the activity of the nitrogenase enzyme. To create an anaerobic environment, heterocysts lack photosystem II (PSII), which is responsible for oxygenic photosynthesis. Instead, they have photosystem I (PSI) to generate ATP for nitrogen fixation.
Therefore, the correct answer is option 'C' - only statement 1 is incorrect.
Statement 1: Mycoplasma and N2-fixation bacteria both thrive in anaerobic conditions.
This statement is incorrect. Mycoplasma is a type of bacteria that does not have a cell wall and can survive in a wide range of environments, including both aerobic and anaerobic conditions. On the other hand, nitrogen-fixing bacteria, which include species like Rhizobium and Azotobacter, require aerobic conditions for their growth and nitrogen fixation process. These bacteria use oxygen as a cofactor for the nitrogenase enzyme, which is responsible for converting atmospheric nitrogen (N2) into a usable form for plants.
Statement 2: Nitrogenase enzyme and PSII are absent in heterocysts of Nostoc.
This statement is correct. Heterocysts are specialized cells found in filamentous cyanobacteria like Nostoc. They are involved in nitrogen fixation, a process that requires anaerobic conditions because oxygen inhibits the activity of the nitrogenase enzyme. To create an anaerobic environment, heterocysts lack photosystem II (PSII), which is responsible for oxygenic photosynthesis. Instead, they have photosystem I (PSI) to generate ATP for nitrogen fixation.
Therefore, the correct answer is option 'C' - only statement 1 is incorrect.
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Mark the correctstatements-(1) mycoplasma and N2- fixation bacteria both thrive for anaerobic condition(2) nitrogenase enzyme and PSII absent in heterocyst of nostocHow many statements are correct -a)only 2b)both 1 and 2c)only 1d)neither 1 and nor 2Correct answer is option 'C'. Can you explain this answer?
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