Crossword Puzzle Photosynthesis CrosswordOnline version Test your knowledge of photosynthesis with this crossword puzzle. by Kathryn DeGioia 1 Green pigment essential for photosynthesis. 2 Element absorbed from the air 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 Small openings on leaves for gas exchange. 7 Process by which plants convert light into energy. 8 Liquid absorbed by plants during photosynthesis. 5 1 7 6 2 8 4