<prompt> True about first order kinetics is:A constant amount is eliminated in unit timeThe half-life increases with an increase in doseThe rate of elimination is constantThe rate of elimination is proportional to the plasma concentration  <response>: Ans. d. The rate of elimination is proportional to the plasma concentration Ref: Katzung 12e p43-44: KDT 7e p30-31, 6e p31-32Rate of elimination is proportional to plasma concentrationQ first order kinetics Linear kinetics.First Order Kinetics Linear kineticsZero Order Kinetics Non linear Kinetics Constant fraction of drug is eliminated per unit of timeQ. Rate of elimination is proportional to plasma concentrationQ. Clearance remains constantQ. Half-life remains constantQ. Most of the drugs follow first order kineticsQ. Constant amount of the drug is eliminated per unit timeQ. Rate of elimination is independentQ of plasma concentration. Clearance is more at low concentrations and less at high concentrationsQ. Half-life is less at low concentrations and more at high concentrationsQ. Very few drugs follow pure zero order kinetics e g. alcoholQ Any drug at high concentration when metabolic or elimination pathway is saturated may show zero order kineticsQ. 