Mycorrhiza represents

High density of an elephant population in a given area results in:

In an association of two animal species,one is a termite which feeds on wood and the other is a protozoan $Trichonympha$ present in the gut of the termite. What type of association do they establish?

Two closely related species competing for the same resources cannot coexist indefinitely and the competitively inferior will be eliminated eventually. This principle is known as:

Which of the following mechanisms helps organisms protect themselves from predators?

Species $A$ $(-)$ and Species $B$ $(O)$ show which of the following interactions?