The demand for efficient green chemistry processes for the synthesis of nanoparticles has sparked the interest of many researchers in recent years. Plant biomolecules such as terpenoids, flavones, ketones, aldehydes, proteins, amino acids, vitamins, alkaloids, tannins, phenolics, saponins, and polysaccharides can all play a role in the formation of TiO2 NPs as a reducing, capping, and stabilizing agent. This paper presents the reaction model involve in the green synthesis of TiO2 nanoparticles from TiO(OH)2 as a precursor and Abelmoschus esculentus (Okra) seeds extract as a reducing or oxidizing agent. The amount of precursor and seeds in 250 ml of distilled water at room temperature are 0.18 and 10 gm respectively. The dropping rate of extract in precursor solution is taken as 0.1 mL/sec. The extraction of seeds is carried out at 98 ˚C for 4 hours. The rate of consumption of precursor, phytochemicals in extract, water and other species have been discussed along with the accumulation of TiO2 nanoparticles with the help of reaction model. A homogeneous system was assumed for applying lumped parameter model. Moreover, material balance for each reacting species gives the model equations in the form of ODEs. After calculating initial conditions and assuming the reaction parameters, the equations are numerically solved utilizing MATLAB to predict concentration vs. time plots for the various reacting species. The predictions give deeper insights into the reaction mechanism and role of okra extracts in converting the precursor to TiO2. Many researchers are motivated to develop a faster, more environmentally friendly, and less toxic method of synthesizing nanoparticles from biodegradable products such as plant extracts. [ABSTRACT FROM AUTHOR]