Aphids are Hemiptera that suck phloem liquid from plants. Ants are often seen tapping the posterior end of the aphid and collecting the liquid that is released from the aphid's digestive system. In an effort to understand this interaction, several researchers measure the survival rates of aphid populations when ants were present and when they were excluded. Their results are shown.
Which of the following conclusions is most likely correct?
A) Ants derive nourishment from the aphids.
B) Ants protect the aphids from predators.
C) Ants parasitise the aphids.
D) Ants feed the aphids.

Question

Aphids are Hemiptera that suck phloem liquid from plants. Ants are often seen tapping the posterior end of the aphid and collecting the liquid that is released from the aphid's digestive system. In an effort to understand this interaction, several researchers measure the survival rates of aphid populations when ants were present and when they were excluded. Their results are shown. 
Which of the following conclusions is most likely correct?
A) Ants derive nourishment from the aphids. 
B) Ants protect the aphids from predators. 
C) Ants parasitise the aphids. 
D) Ants feed the aphids.

Quizplus · Accepted Answer

The survival rates of aphids were higher in the presence of ants, indicating that the ants are protecting the aphids from predators. There is no evidence to suggest that ants derive nourishment from the aphids, parasitize them, or feed them.

Aphids Are Hemiptera That Suck Phloem Liquid from Plants