how structure of flower contributes to pollination
Wow. What a great topic. Some flowers are very insect specific, requiring long tounges to pollinate, others require bumble bees, or some honeybees, some hummingbirds, some wind, some flys, and so on.
http://www.google.com/search?hl=en&safe=off&client=opera&rls=en&hs=Z5g&q=flower+structure+pollination+insect+moth+wind&btnG=Search