In water, will sucrose be hydrolysed by water to form glucose and fructose molecules? If I dissolve sucrose sugar ($\ce{C_12H_22O_11}$) in water, would the water readily hydrolyse the sucrose sugar to form glucose and fructose sugars?
Not without a catalyst present. The process is usually performed using invertase, but some other enzymes with similar activity exist and addition of acid also can catalyse the reaction.