BIOLOGICAL CLASSIFICATION
KINGDOM MONERA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oxygenic with nitrogenase
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Oxygenic without nitorgenase
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Non-Oxygenic with nitrognase
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Non-Oxygenic without nitrogenase
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Detailed explanation-1: -Cyanobacteria are oxygenic photoautotrophs and nitrogen fixers. Thus, they release oxygen during photosynthesis and also contain nitrogenase enzymes.
Detailed explanation-2: -Note: Cyanobacteria are microscopic and rich in chemical diversity and they use photosynthesis to make their own food in the presence of oxygen so they are oxygenic. They are also nitrogenase as they convert inert atmospheric nitrogen into nitrate or ammonia.
Detailed explanation-3: -Thus, the correct answer is ‘Oxygenic with nitrogenase. ‘
Detailed explanation-4: -It is found in fresh water only. It may be unicellular, colonial or filamentous. They often form bloom in non-polluted fresh water bodies. Colonies are not surrounded by gelatinous sheath.
Detailed explanation-5: -Other cyanobacteria use different strategies to protect their nitrogenase from oxygen. Certain filamentous strains form bundles of filaments. In these bundles, only certain filaments will fix dinitrogen, the other filaments somehow shielding the N2-fixing filaments from oxygen.