Bees can sense electrical charge of flower having nectar. If flower’s nectar has already harvested by any other bee it’s positive electrical charge increases and bee come to know that this flower has no nectar. The nectar that flowers produce is a sweet energy source for bees. Honey bees can detect nectar in a flower by the reflection of ultraviolet light, or by the tone the flower is emitting as it tries to attract pollinators.
