Which kind of relationship seen between mango tree and orchid which grow on branch of mango tree?

There is more competition for survival between

Cattle or goats are never browsing on Calotropis growing in abandoned fields because of the presence of

Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called

Observe the set of $4$ figures $A$, $B$, $C$ and $D$ and, answer the following questions

$(i)$ Which one of the figures shows mutualism ?

$(ii)$ What kind of association is shown in $D$ ?

$(iii)$ Name the organisms and the association in $C$.

$(iv)$ What role is the insect performing in $B$ ?