Pollination is an ecological process that involves the transfer of pollen from the male to the female part of the flower with the help of various abiotic and biotic pollen dispersal agents and is an essential pre-requisite for fertilization and fruit/seed dispersal. Insects constitute one of the primary groups of pollinating agents, as the association between insects and flowers is well established. As flowers radiated so did the mouthparts of the insects exploiting them. Various insect groups, which are of prime significance in the pollination of agricultural and horticultural crops mainly belong to the orders Hymenoptera (bees, ants and wasps), Diptera (flies, mosquitoes, fungus gnats, midges), Coleoptera (beetles and weevils), Lepidoptera (moths and butterflies), Thysanoptera (thrips), Hemiptera (bugs) and Neuropteran (lace wing flies). This work is mainly based on detailed and through observations/study made from various cash crops viz., Brassica nigra, Coriandrum sativum, Tagetes erecta and Helianthus annuus from North 24 Parganas of South Bengal region.