Explanation: Photosynthesis is a chemical reaction that occurs inside plants' leaves, in a place called chloroplasts, in which contains a pigment called chlorophyll. In this process, plants use light from the Sun, carbon dioxide and water and produces glucose and oxygen. Glucose is used to all of the plants metabolic needs. It is a process that "recycles" carbon dioxide and transforms it into oxygen.
Membrane pores are part of cells. And these pores are to small for big starch molecules to pass through, but perhaps the simpler glucose molecule could pass through. Hope this helps!