Define limiting agent .

Define limiting factor.

Define oxidising agent and reducing agent on the basis of oxidation number concept.

Define limiting reactant or limiting reagent

Define biocontrol agents.

Define elastic limit and discuss stress-strain graph

Define friction. What is its cause? Distinguish between static friction, limiting friction and kinetic friction. How do they vary with the applied force?

Explain that SO_2 can act as an oxidising agent as well as a reducing agent, but SO_3 can act as an oxidising agent only.

Name the common pollinating agents.