the pores are too tiny for the starch to move through it, the glucose does pass through it if the glucose is not complex, it must be simple glucose
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!
Membrane pores are typically around 4 Angstroms (0.4 nm) in size, while starch molecules are much larger than 100 nm. This size difference prevents starch from passing through most biological membranes. Cells rely on this selective permeability to manage the substances that enter and exit them.
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