$A$ parasite that lives on another parasite is called:

An orchid plant grows on the branch of a mango tree. What type of interaction exists between the orchid and the mango tree?

Which of the following plants develops various structures for protection against herbivores?

If $'+'$ sign is assigned to beneficial interaction,$'-'$ sign to detrimental and $'O'$ sign to neutral interaction,then the population interaction represented by $'+, -'$ refers to

Which of the following 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

Give scientific reasons: The members of a population do not breed with other populations.