Mots Croisés Photosynthesis CrosswordVersion en ligne Test your knowledge of photosynthesis with this crossword puzzle. par Erin Houston 1 Green pigment essential for photosynthesis. 2 Element absorbed from the atmosphere during photosynthesis. 3 Gas released as a byproduct of photosynthesis. 4 Primary source of energy for photosynthesis. 5 Sugar produced by plants during photosynthesis. 6 Pores on plant leaves that facilitate gas exchange. 7 Complex of proteins and pigments involved in photosynthesis. 8 produced stage 2 of photosynthesis 9 produced in stage 1 of photosynthesis 10 Diffuses from cell stage 1 1 7 6 9 5 2 8 3 10