Insect pollinators include bees, (honey bees, solitary species, bumblebees); pollen wasps (Masarinae); ants; a variety of flies including bee flies and hoverflies; lepidopterans, both butterflies and moths; and flower beetles.
Kinds of Bees. Honeybees are unable to buzz-pollinate tomato flowers. They don't have that behavior, and there's no reason for them to visit the flowers because the pollen is enclosed inside the anthers, unavailable for collection, and there is no nectar reward.  Pollination is a process in which pollen is transferred to the female reproductive organs of seed plants, thereby enabling fertilization and reproduction through growth of the pollen tube and eventual release of sperm. This is biotic pollination. The various flower traits (and combinations thereof) that differentially attract one type of pollinator or another are known as pollination syndromes. Roughly 200,000 varieties of animal pollinators are in the wild, most of which are insects. Millions of hives of honey bees are contracted out as pollinators by beekeepers, and honey bees are by far the most important commercial pollinating agents, but many other kinds of pollinators, from blue bottle flies, to bumblebees, orchard mason bees, and leaf cutter bees are cultured and sold for managed pollination. Euglossine bees pollinate orchids, but these are male bees collecting floral scents rather than females gathering nectar or pollen. Female orchid bees act as pollinators, but of flowers other than orchids. Eusocial bees such as honey bees need an abundant and steady pollen source to multiply. A pollinator is the biotic agent (vector) that moves pollen from the male anthers of a flower to the female stigma of a flower to accomplish fertilization or 'syngamy' of the female gametes in the ovule of the flower by the male gametes from the pollen grain. Euglossine bees pollinate orchids, but these are male bees collecting floral scents rather than females gathering nectar or pollen. Female orchid bees act as pollinators, but of flowers other than orchids. Eusocial bees such as honey bees need an abundant and steady pollen source to multiply. Types of Pollinators. Bees share the job of pollinating. Some plants are pollinated by other animals, wind or water. Plant flowers have adapted to the different pollinators. Some birds, especially hummingbirds, pollinate plants. The plants that attract birds are generally brightly coloured, with red, orange or yellow flowers, but are often odourless, since birds have a poor sense of smell. The flowers are often long and tubular, with lots of nectar, and are sturdy enough for perching on Comments. Submit. Plants that do not self-pollinate need other means to reproduce. These plants attract pollinators with their flowers, which lure insects, sometimes birds, with their pollen and nectar. Bees are among the active pollinators of plants, but not all plants attract bees. They only go to plants with flowers that have quality pollen and nectar. Bees pollinate many flowering plants and those included here are just a few examples. Anthecology is the scientific study of pollination. Insect pollinators include bees, (honey bees, solitary species, bumblebees); pollen wasps (Masarinae); ants; a variety of flies including bee flies and hoverflies; lepidopterans, both butterflies and moths; and flower beetles. Euglossine bees pollinate orchids, but these are male bees collecting floral scents rather than females gathering nectar or pollen. Female orchid bees act as pollinators, but of flowers other than orchids. Eusocial bees such as honey bees need an abundant and steady pollen source to multiply. Honey Bees are Important Pollinators. Pollination is the movement of male pollen to the female part of the flower (stigma), the first step in successful seed and fruit production by the plant. Self-pollination is when pollen is transferred from the anther to the stigma within a single plant. Although some of these crops are pollinated by bee species other than honey bees, honey bees are the only ones that can be easily managed, moved around and are known to exploit a wide variety of crops. While a worker bee is in a flower gathering nectar, pollen from the anther often sticks to her hairy body. It has often been said that bees are responsible for one out of every three bites of food we eat. Most crops grown for their fruits (including vegetables such as squash, cucumber, tomato and eggplant), nuts, seeds, fiber (such as cotton), and hay (alfalfa grown to feed livestock), require pollination by insects.  POLLINATION BY HONEY BEES. Honey bees are good pollinators for many reasons. Their hairy bodies trap pollen and carry it between flowers. The bees require large quantities of nectar and pollen to rear their young, and they visit flowers regularly in large numbers to obtain these foods. 
http://homeguides.sfgate.com/kind-bees-pollinate-tomatoes-70564.html https://en.wikipedia.org/wiki/Pollination https://en.wikipedia.org/wiki/Pollinator https://en.wikipedia.org/wiki/Pollinator http://bees.techno-science.ca/english/bees/pollination/types-of-pollinators.php http://www.gardenguides.com/106764-flowers-bees-pollinate.html https://en.wikipedia.org/wiki/Pollinator http://ag.arizona.edu/pubs/insects/ahb/inf10.html http://nativeplants.msu.edu/about/pollination http://www.aces.uiuc.edu/vista/html_pubs/BEEKEEP/CHAPT8/chapt8.html
what types of bees pollinate