Entomophily (insect Pollination):
The significant pollinating insects are butterflies, bees, moths, wasps, beetles and so on. The insects visit the flowers for nectar, edible pollen grains or shelter. The bees are the main visitors of flowers and they acquire both nectar and pollen from the flowers. They contain pollen sacs or pollen baskets for collecting pollen. The significant characteristics of insect pollinated flowers are as follows:
1. The flowers are big or when small they are grouped into inflorescence
2. The flowers are generally brightly colored and contain specific odor.
3. The flowers generally hold nectar or edible pollen.
4. They generate fewer pollen grains.
5. Stigmas and Anthers are generally inserted.
6. Stigmas are generally not branched and might be flat or lobed.
A detailed study of the inter-relationship among the structure of flower and insect pollinators clearly points out that some angiospermous plants are dependent upon a specific type of insect for pollination.
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