Microorganisms can solve the global problem of arsenic (As) contamination in soil and water, by eliminating the hazardous metalloid from contaminated habitats. A native As- resistant PMM6 strain was isolated from the tainted agricultural field in Durgapur, India. Following phenotypic investigations, fatty acid methyl ester analysis, and 16S rDNA sequence-based homology, it was identified as Bacillus cereus. Various analytical techniques such as Atomic absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray fluorescence, Scanning electron microscopy, Transmission electron microscopy, and energy dispersive X-ray spectroscopy studies revealed a positive correlation between the strain's resistance properties against arsenate (75 mM) and arsenite (25 mM)) and the biosorption and bioaccumulation of arsenic. The strain exhibited several important plant growth-promoting traits, including indole-3-acetic acid production (110.0 ± 0.33 μg/mL), 1-aminocyclopropane-1-carboxylate deaminase activity (2334.2 ± 1.90 nm α-ketobutyrate/mg protein/h), phosphate solubilization, and siderophore production (68.0 ± 2%). These traits facilitated the growth augmentation of rice seedlings under As stress, both in terms of physiological and biochemical parameters. Compared to un-inoculated soil, the use of strain PMM6 helped reduce As mobilization and oxidative stress in rice seedlings growing in As-spiked soil. Therefore, strain PMM6 holds the potential as bioremediator to restore As-contaminated agricultural lands while also promoting the growth of rice seedlings. It could thus be utilized in the bioremediation of As-contaminated agricultural lands in the near future.