Question

question: which gas do plants expel in the troposphere during photosynthesis? answer options: select one of four nitrogen water vapor oxygen carbon dioxide

Explanation:

Photosynthesis is a process in plants where they use carbon dioxide and water (in the presence of light energy) to produce glucose and oxygen. The oxygen is released as a by - product. Nitrogen is not a product of photosynthesis. Water vapor is not the main gas expelled during photosynthesis (plants do transpire water vapor but that's a different process). Carbon dioxide is taken in during photosynthesis, not expelled. So the gas plants expel during photosynthesis is oxygen.

Answer:

Oxygen