question_answer 21)

  Fungicides and antibiotics are chemicals that (a) enhance yield and disease resistance                              (b) kill pathogenic fungi and bacteria, respectively (c) kill all pathogenic microbes                                    (d) kill pathogenic bacteria and fungi respectively  

Answer:

                  (b) A wide range of fungal, bacterial and viral pathogens, affect the yield of cultivated crop species. Fungicides and antibiotics are chemicals that kill pathogenic fungi and bacteria, respectively.