Whoa big question. Also, how is the stigma adapted for capturing pollen?
How are anthers and pollen grains adapted for distributing pollen?
Wow that is a big question. There are a lot of adaptations, and they are different depending on how the plant is pollinated. For example in wind pollinate species, the anthers hang out of the flower so they can get dispersed by the wind, the pollen is usually smooth or has air sacs and the stigma is feathery to increase the surface area and also hangs out of the flower.
In animal pollinated species, the anthers are usually prominently displayed so the pollinator can find them, the pollen is spiky so it can attach to the pollinator and the stigma is located somewhere the pollinators can get to it and is sticky. These are just generalizations and there are many variations on this theme.
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