Mycology Plant Pathology

Which of the following statements about extent of infection and perpetuation of pathogen are correct?
(A). Disease which is confined to a particular part or organ is known as systemic disease.
(B). Arhar wilt is a soil-borne disease
(C). Smut disease of cereals are seed-borne
(D). Mildew and rusts are air-borne

Bacterial cells are more resistant to osmotic shock than eukaryotic cells due to the -