Question

how did scientist prove that phlegm carries food​

Answer 1

Answer:

they had chosen the aphid which was sucking food from phloem through its probosis and the they cut the aphid and left the probosis in the bark of the tree when they took out the probosis from the bark they found that some honey like substance is stuck the probosis of the aphid but when they examined it they found that ......it was the glucose which was going through the phloem.