Killing an organism for feeding is known as:

Which of the following is most appropriately defined?

Which of the following mechanisms helps organisms protect themselves from predators?

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 $C$.

This type of life ensures an inexpensive arrangement for living and eating.

Match the following population interactions with their respective signs and descriptions:

Interaction Type	Sign	Description
$(a)$ Parasitism	$(i) -, 0$	$(A)$ Both get benefitted
$(b)$ Amensalism	$(ii) -, -$	$(B)$ One gets harmed,other has no effect
$(c)$ Competition	$(iii) +, -$	$(C)$ Both get harmed
$(d)$ Mutualism	$(iv) +, +$	$(D)$ One is harmed and second is benefited