Question

two adaptations of sunflower for successful pollination

Answer 1

Flowers need to be pollinated. Pollination is the process of moving the pollen grain from the anther of a stamen to the stigma of a carpel. There are a few flowers that can self-pollinate all on their own, but this limits them to inbreeding. Most species rely upon some kind of pollination vector to accomplish pollination. The vector can be any agent that can move pollen from anther to stigma.
There is evidence of water and wind as the pollination vector in certain species, but many species do not depend upon the random or downstream-only pollination pathways offered by these vectors. Indeed such vectors are only useful in situations where large populations of a very limited number of species are present.
Most flowers have evolved to use a "smart bomb" or "magic bullet" vector...animals! These vectors have sensory organs to locate flowers, they have locomotion to get them to the flowers in spite of large spaces between individuals, and they have enough intelligence to remember that they can depend upon a reward if they visit one particular species repeatedly.

Answer 2

The first pollinators accidentally spread pollen while feeding on flowers.

... reproduction of both bees and flowers, so the two groups have coevolved for mutual success.

Adult bees evolved behavioral and physiological adaptations to gather and ...

A flower's color, odor, shape, size, timing, and reward (nectar or pollen)