Early studies on the pathway of $CO_2$ fixation in plants were made during the $1940$s in:

  • A
    Unicellular green algae by Calvin
  • B
    Isolated chloroplast of spinach by Hill
  • C
    Mesophyll cells of variegated leaves by Arnon
  • D
    Bundle sheath cells of maize by Hatch and Slack

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