Which of the following is an ectoparasite?

This type of life ensures an inexpensive arrangement for living and eating.

Match the following columns correctly.

Column-$I$	Column-$II$
$(a)$ Plasmodium	$(i)$ Partial parasite
$(b)$ Cuscuta	$(ii)$ Endoparasite
$(c)$ Bacteriophage	$(iii)$ Ectoparasite
$(d)$ Viscum	$(iv)$ Hyperparasite

Choose the correct group for commensalism from the following:
$(a)$ The cattle egret and grazing cattle
$(b)$ Barnacle balanus and Barnacle chathamalus
$(c)$ Goat and Abingdon turtle from Galapagos island
$(d)$ Barnacles growing on the back of whale

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 $B$?

Which kind of relationship is seen between a mango tree and an orchid that grows on the branch of the mango tree?