Association between an orchid growing on a mango tree is that of
Commensalism
Commensalism means one organism benefits and the other organism isn't harmed by the partnership. In this relationship, the orchid benefits by this association by obtaining food and water from the mango tree, while the mango tree is not affected by this relationship, therefore this association is commensalism. Parasitism is a relationship where one organism benefits while the other is harmed, if the orchid growing on the mango tree harmed the tree, the relationship would have been parasitism. Mutualism is a relationship that is beneficial for both the partners and Amensalism is where one partner is harmed while the other is unaffected.