Class 12th Biology 2012 Set1 Outside Delhi Board Paper Solution

Brood parasitism is a method of parasitism in which the organism lays its eggs in the nest of other birds and let that other bird to incubate them. Brood parasitism occurs in birds. An example is when the cuckoo bird lays its eggs in the nest of crow and during the period of evolution, eggs of cuckoo bird has began to resemble with the eggs of crow.