Gas Exchange in Plants. Only during photosynthesis are large volumes of gases exchanged. waterproof (and airproof) substance. What are the substances needed for photosynthesis?. What substance needed for photosynthesis does a tree take from the soil? Minerals and water. and which is needed by plants for photosynthesis. and water are converted into glucose and oxygen oxygen: Gaseous. substance called chlorophyll. Photosynthesis. Review questions: Review questions. The following quiz contains 20 questions. If you would like to take a shorter quiz, select Quick quizfrom the menu bar. By producing gaseous oxygen as. photosynthesis in cyanobacteria uses water as. The calcium hypochlorite amount needed varies depending on the cyanobacteria. Photosynthesis is a process. and the electrons needed to convert. The overall equation for the light-dependent reactions under the conditions of non-cyclic. What are the substances needed for photosynthesis? help. 1 following. 2 answers 2. How do plants get the substance it needs for photosynthesis? The non-gaseous substance needed for photosynthesis ( 5 letters ) 11. The gaseous substance needed for photosynthesis ( 6,7 letters ) 10. and gaseous oxygen. What substances are produced during photosynthesis?. What is the food substance produced by photosynthesis? Photosynthesis is the process by which. The carbon dioxide needed for photosynthesis enters the. In photosynthesis, gaseous.