An orchid living on a tree exhibits

🔑Key Points
In commensalism, one species is benefitted (commensal) while another remains unaffected.
In the case of the orchid on a tree, the orchid (epiphyte) is benefitted as it gets support while the tree remains unaffected.
🛑Additional Information
Symbiosis is any type of close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalism, or parasitic.
Mutualism is defined as an interaction between individuals of different species that results in positive (beneficial) effects on per capita reproduction and/or survival of the interacting populations.
Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey.
Parasitism is a nonmutual relationship between two organisms in which one benefits at the expense of the other.