Class 12 NEET Biology Organisms and Populations

A leopard and a lion in a forest/grassland exemplify competition where both the species are competing for the same resources.
A cuckoo laying egg in a crow's nest is brood parasitism where cuckoo is the parasitic bird that lays its egg in the nest of crow (host bird).
Fungi and root of a higher plant in mycorrhizae exemplify mutualism where both the species are benefitted. The fungi help the plant in the absorption of essential nutrients from the soil while the plant in turn provides the fungi with energy yielding carbohydrates.
A cattle egret and a cattle in a field exemplify commensalism where one species benefits and the other remains unaffected.
The egrets always forage close to where cattle are grazing because the cattle, as they move, stir up and flush out insects from the vegetation that otherwise might be difficult for the egrets to find and catch.