question_answer 19)

  The organisms which cause diseases in plants and animals are called (a) pathogens    (b) vectors                          (c) insects                            (d) worms

Answer:

                  (a) A wide range of organisms including bacteria, viruses, fungi, protozoans, helminthes etc., cause diseases in plants and animals. Such disease causing organisms are called pathogens. While vectors are the carriers of pathogens which may be insects or worms.