No they do not
A plant with a sticky stigma is more likely to be insect-pollinated. The stickiness of the stigma helps to capture pollen grains brought by insects. Wind-pollinated plants typically have feathery stigmas to catch pollen grains carried by the wind.
Insect-pollinated flowers are often brightly colored, have nectar guides or fragrances to attract insects, and have sticky pollen grains that adhere to insects for transfer. Water-pollinated flowers are often dull in color, lack nectar or fragrance, and produce large quantities of light, buoyant pollen grains that can be carried through water currents for dispersal. Additionally, water-pollinated flowers tend to have feathery stigmas that can easily capture pollen carried by water.
the insect does
wind pollinated
Aspidistra. Pollinated by snails.
flowers are pollinated by insect
bright flowers get pollinated because the insect attract them because of the color of the flower
Nectar
Daisies, dandelions and roses are examples of plants that depend on insects for pollination. Grasses are an example of plants that depend on the wind for pollination. In grass, flowers are grouped together in twos and threes forming spikelets. The flowers are small but they have the same basic structure as an insect pollinated flower. They have ovaries, stigmas, stamens and petals. However, a dandelion is both a wind and insect pollinated flower, depending on its state.
It is not necessary. Some flowers attract insect by their bright color as in case of Petunias.
Color and fragrance are two adaptations of insect-pollinated flowers. Flowering plants which benefit from insect pollinators need to call attention to themselves by arthropod-attractive scents and striking colors.
The pride o barbados is insect pollinated because it produces sweet nectar and is brightly coloured which attracts insects.