A constricting ring formed by Arthrobotrys traps a nematode.Fungal hyphae invade and digest the nematode.This is an example of a _______ interaction.
A) Saprobic
B) Competitive
C) Predatory
D) Parasitic
E) Mutualistic

Question

Quizplus · Accepted Answer

The fungal hyphae constrict and trap the nematode, which is then invaded and digested, indicating a predatory interaction. A saprophytic interaction is one in which the fungus feeds on dead organic material, not a living prey. Competition is when two or more species compete for resources; this is not the case here, as the nematode and fungus are not competing for the same resources. Parasitic interaction involves the parasite (fungus) benefitting at the expense of the host (nematode), but this does not apply here as the nematode is not providing any benefit to the fungus. Mutualistic interactions involve both species benefiting from the interaction, which is not the case here, where only the fungus benefits by obtaining nutrients from the nematode.

A Constricting Ring Formed by Arthrobotrys Traps a Nematode