Which of the following is not an example of a prey-predator relationship?

Bacteria decomposing organic matter

The answer is (c), bacteria decomposing organic matter.

A prey-predator relationship is a type of interaction in which one organism, the predator, hunts, kills, and eats another organism, the prey. The prey is harmed or killed in this interaction, while the predator benefits.

Bacteria do not hunt, kill, or eat other organisms. They decompose organic matter, which is a process that breaks down dead organisms into simpler substances. This process is essential for the recycling of nutrients in the ecosystem, but it is not a prey-predator relationship.

The other options are all examples of prey-predator relationships. Tigers hunt and eat deer, Nepenthes plants trap and eat insects, and crocodiles hunt and eat humans.