Mycorrhiza is an example of which of the following?

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

Interspecific interactions arise from the interaction of

Even a plant species,which makes its own food,cannot survive alone; it needs soil microbes to breakdown the $A$ matter in soil and return the $B$ nutrients for absorption. And then,how will the plant manage pollination without an animal agent? It is obvious that in nature,animals,plants and microbes cannot live in $C$ but interact in various ways to form a biological community. Choose the correct option for $A, B$ and $C$.

If the strong partner is benefitted and the weak partner is damaged,it is known as:

In the following,which interaction is indicated by $+/-$?