How does the hair on a bee's body help in pollinating flowers?

Pollen sticks to the hairs. This not only helps in collection but also in pollination as any pollen missed by the bee rubs off in the next flower.

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The hairs on a bee are plumose -- that is, they are branched, like tiny ferns. When the bee is in flight, the hairs build up a small charge of static electricity and this attracts the pollen grains to the hairs. The bee can then brush the pollen back to the corbiculae (pollen baskets) on the back legs to carry it back to the hive.