how do they make the children fear books and flowers

In Chapter Two, the students tour the Central London Hatchery and Conditioning Centre. While there, they watch "Neo-Pavlovian Conditioning," a technique that trains infants. Here, the use of electric shocks and sirens in response to touching roses or books modifies the behavior of Deltas. This discourages behavior that might destabilize society, such as allowing Deltas to read books and acquire knowledge. The students also view a group of sleeping infants who receive moral instruction through hypnopaedic learning as they sleep. Sleeping babies listen to repeated catchphrases, and in this chapter, infant Betas listen to a tape played hundreds of times which indoctrinates them to believe they are superior to Gammas, Deltas and Epsilons, but not as clever as Alphas.