Answer:
1) Photosynthesis is an endothermic reaction.
2) During photosynthesis sunlight is transferred from the environment to the plant by diffusion.
3) It used to convert carbon dioxide into oxygen. Glucose is also formed and released.
4) Leaves are well adapted to allow the maximum amount of photosynthesis to take place.
This is what I think so please do not rely on me completely and try to do some research if possible. Otherwise I hope this helped you! :)