Dear student,
Insect pollination is known as entomophily.
Because insects are the carriers,the flowers has to be attractive to attract insects.
Characteristics of flowers:
1) Flowers are large , conspicuous, brightly coloured.
2) Petals are large and attractive.
3)Small flowers bloom in bunches to attract insects like sunflower.
4) Different colours of flowers attract different insects.Eg-white flower attracts moths,red colour attracts butterflies.
5)Some flower are edible eg- Rosa, magnolia.
6)Some flower possess yellow sticky substance to attract insects.
Regards.