Free convection boundary layer flow past a horizontal flat plate embedded in porous medium filled by nanofluid containing gyrotactic microorganisms

► Free convection on a horizontal plate. ► Porous medium saturated with nanofluid containing gyrotactic microorganisms. ► Numerical solutions for velocity, temperature, nanoparticle concentration and motile microorganisms density. ► Graphs for local Nusselt, Sherwood and motile microorganism numbers. ► Effects of bioconvection and buoyancy parameters.