Puzzle 1: History of Photosynthesis

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Across
  1. 2. : Showed sunlight is essential for air purification.
  2. 3. : Split light to illuminate Cladophora (Engelmann).
  3. 6. : Gas released by plants, proven by Priestley.
  4. 7. : Hydrogen donor in green plants (not H2S).
  5. 10. : Algae used in action spectrum experiment.
  6. 11. : Produced by plants during growth (Sachs).
Down
  1. 1. : Purple and Green ___ bacteria used by Van Niel.
  2. 4. : Experiment with leaf in KOH (Half-leaf).
  3. 5. : Plants ___ the air injured by breathing animals.
  4. 8. : Setup used by Priestley with a candle and mouse.
  5. 9. : Light color with maximum photosynthesis (along with Red).