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An analysis has been carried out to study an unsteady MHD convective non-Newtonian fluid flow in the presence of heat source and radiation absorption. The governing partial differential equations along with the boundary conditions are first cast into a dimensionless form and then the equations are solved by closed analytical method. The effect of various physical parameters like porous permeability, Prandtl number, heat source, radiation absorption, diffusion-thermo, Schmidt number and chemical reaction parameter on velocity, temperature and concentration profiles are presented graphically. The effects of all these parameters on wall velocity gradient, wall temperature gradient and wall concentration gradient are also discussed with the help of tables. Temperature increases in the presence of heat source, radiation absorption parameter and Dufour number while decrease in the presence of Prandtl number and radiation parameter. [ABSTRACT FROM AUTHOR]