Q47 / 432 · NTA Abhyas (NEET) 2020 · Botany · Biological Classification

Monerans with both carbon and nitrogen reducing enzymes are

  • A
    All photosynthetic bacteria
  • Correct answer
    B
    Heterocystous BGA and some photosynthetic bacteria
  • C
    Heterocystous BGA but no eubacteria
  • D
    All photoautotrophic bacteria and some BGA

Solution

Cyanobacteria or blue-green algae and photosynthetic bacteria (contain chlorophyll, are placed under kingdom Monera. Nitrogen fixing cyanobacteria need only nitrogen and carbon dioxide to live. The presenece of heterocysts, which contain the enzyme nitrogenase, vital for nitrogen fixation.

Hence, the correct answer is option: 'B'.

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