Its location varies from species to species. This tissue is connected to phloem and secretes the sweet liquid known as nectar. This is a carbohydrate rich droplet that is used as an energy source for vectors. Hummingbirds must consume vast quantities of nectar to continue their high-energy method of flight. It is the sole energy source for most butterflies.
Bees collect the nectar and evaporate it down to make honey for winter supplies.
Pollen Pollen itself is decent vegetable food. It contains protein, starch, oil, and other nutrients. It is far richer than nectar in vitamins and minerals too. For beetles and bees, the consumption and collection of pollen is critical. It is their basic protein supply.