The mode of nutrition in butterflies is known as hetrotrophic nutrition (deriving from other living organisms),as it gets it's food from plants (nectar)....
......While it's mode of ingestion is called as probosis (sucking through a long tube)
Prakruti Patel answered this
butterfly have heterotrophic mode of nutrition . they sucks the nectar (sweet juice) from flowers.
Ghghghghg answered this
THEY SUCK NECTAR WITH THE HELP OF FEEDING TUBES (IN THIER FEET) FROM FLOWERS!!