    Sentence & What happens fo reactive oxygen  species signals since they don't leave the  chloroplost?    \Sentonce 2 After detecting stress in o coll,  which might bg @ve fo 9 pathogen, chloroplasts  begin produc! ules like salicylic ackd,  jasmonic acid, nitric oxide ond reactive oxygen  species which con serve os dofense-signals.   *    4