An organism exhibits the following characteristics: I. Loss of unnecessary sense organs II. Presence of suckers III. Loss of digestive system IV. High reproductive capacity Which of the following represents the nature of the population interaction between this organism and its host? (Species A = organism, Species B = host)

Step-by-step solution

The characteristics given (loss of unnecessary sense organs, presence of suckers or adhesive organs, loss of digestive system, and high reproductive capacity) are specific adaptations of parasites as described in NCERT. Parasitism is a population interaction where the parasite (Species A) benefits at the expense of the host (Species B), which is harmed. Therefore, the interaction is represented by '+' for the parasite and '-' for the host, resulting in a (+, -) interaction. Answer: +(A), -(B)