questions

Question

1) why is it that by Modim we dont bend our knees when we bow? 2) if i forgot to bow during Amida, do i need to repeat that bracha? 3)if a person's nose is conected to the part of the brain that tastes, he is able to taste whatever he smells. is it assur for this person to smell non-kosher food? (since he is tasting it) thank yaou ao