KCET 2014 Biology Solved Paper

Commensalism is an association in which one (commensal) is benefitted and the other (host) is unaffected. Ectocommensals, for example, orchids, bromeliads grow on the branch of the mango tree. They benefit from this support by reaching positions where the light is better or where there is less competition for light. Mago tree remains unaffected.