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Railways PYQCBT 2 2017

RRB NTPC · Question 46

Which of the following organisms releases molecular oxygen into water?

  1. E.coli

  2. Amoeba

  3. Salmonella enterica

  4. Phytoplankton

Show answer & explanation

Answer: (D) Phytoplankton

Explanation

Phytoplankton are microscopic photosynthetic organisms; they release oxygen into water and produce about half of Earth's oxygen. E. coli, amoeba and Salmonella do not photosynthesise.