In the vast marine ecosystem, certain seas develop red colouration. This red colour is due to the presence of a large population of which one of the following organisms?

  • A
    Trichodesmium erythreum
  • B
    Physarum
  • C
    Dinoflagellates
  • D
    Diatoms and members of red algae

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What is the genetic material of cyanobacteria known as?

Autotrophic bacteria - $P$
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Select the correct option for $P$ and $Q$.

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