it must land on the pistil
Air born pollen can land any where on a flower but effective only if land on a stigma .
stigma True, but Ill explain more... Pollen from the Stamen- (male reproductive parts of a flower) must land on the Pistil-(female reproductive parts of a flower) for fertilization to occur, and thats when the seed grows in the ovary. :)
In order for pollination to occur, what must happen to the pollen grains is that they have to be transferred to the stigma in a flower of the same species. The stigma is the female part of the flower.
Pollen is male part of the flower and stigma is the uppermost part of the gynoecium (which is female part). Thus stigma does not produce pollen, rather pollen land on stigma after pollination to fertilize the egg inside the ovary of the flower.
A flower petal attracts insects and other life forms that may spread it's pollen to other plants. This allows for reproduction.
Stigma of the flower
So the pollen will stick.
Land plants no longer require water as a medium for reproduction with evolution because with the evolution of seeds and pollen it is no longer needed.
The sweet scent attracts bugs, the bugs land on the flower and when they fly away they have pollen stuck to their feet, so when they land on another flower they begin pollenation which helps other plants grow.
Out of hundreds and thousands of pollen grains produced by each flower a few land on the stigma during pollination and others just wither away.
Pollen grains, which to us look like powder, are blown by the wind to a nearby flower of the same species, where they can land and fertilize the egg. (a flower's ovum and pollen correspond to egg and sperm). Thus the plants reproduce sexually with a partner other than themselves!
Bees do not ' know' anything. They just fly from flower to flower gathering pollen and nectar to take back home and feed baby bees. In the process, bees accidentally leave a wee bit of that pollen on other flowers - just enough to pollinate them.