What are the organisms that feed on plant sap and other plant parts called?

Which of the following is the correct reason for the extinction of Abingdon tortoises in the Galapagos Islands?

If a predator overexploits its prey in an ecosystem,what might be the consequences of this?

What is the relationship between the $Ophrys$ orchid and the male bee?

The interaction between two living organisms of different species which is beneficial to both but is not obligatory because they can live without each other is known as

Observe the set of $4$ figures $A$,$B$,$C$ and $D$ and answer the following questions:
$(i)$ Which one of the figures shows mutualism?
$(ii)$ What kind of association is shown in $D$?
$(iii)$ Name the organisms and the association in $C$.
$(iv)$ What role is the insect performing in $B$?