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The present article emphasizes on Bioconvection (Cu– Al2O3–TiO2)/H2O modified nanoliquid flow in the crown cavity considering the impact of gyrotactic microorganisms. The bioconvection flow is examined in a crown cavity containing a square obstacle, oxytactic bacteria and occupied by modified nonliquid. In order to simulate the partial differential equation of the model, the finite element method is used. The results of the study are exhibited in the form of streamlines, isothermals and isoconcentrations of oxygen and microorganism. The Kinetic energy, Nusselt number, Sherwood number and density of motile microorganisms are also discussed. It has been noticed that the density of motile microorganisms is enhanced with the effect of the Bioconvection parameter, Lewis and Peclet numbers.