Choose 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 Galapagosisland

$(d)$ Barnacles growing on the back of whale

Association between suckerfish $ (Remora) $ and shark is

In an aquarium two herbivorous species of fish are living together and feeding on phytoplanktons. As per the Gause’s Principle, one of the species is to be eliminated in due course of time, but both are surviving well in the aquarium. Give possible reasons.

Level of competition between species depends on

$I.$ availability of resources

$II.$ population density

$III.$ group interaction of organism

Choose the correct combination

Competition is a rivalry between two or more organisms for obtaining the same resources. It is a type of

In following which are examples of commensalism ?

$(1)$ Monarch butterfly and bird

$(2)$ Orchid and mango

$(3)$ Fish and flamingo

$(4)$ Calotropis and cattle

$(5)$ Cattle egret and grazing cattle