Killing an organism for feeding is known as:

Assertion : Animals adopt different strategies to survive in hostile environments.
Reason : Praying mantis is green in colour which merges with plant foliage.

Match the columns:

Column-$I$	Column-$II$
$(a)$ Predation	$(i)$ Cuscuta and hedge plant
$(b)$ Commensalism	$(ii)$ Balanus and Chathamalus
$(c)$ Parasitism	$(iii)$ Cactus and Moth
$(d)$ Competition	$(iv)$ Orchid and Mango

Which of the following is most appropriately defined?

$A$ cuckoo laying eggs in the nest of other species of birds is an example of

Which of the following is most commonly cited as a predator?