Mention one application for each of the following :
(a) Passive immunization
(b) Antihistamine
(c) Colostrum
(d) Cytokinin-barrier
(a) Passive immunization - it provides performed antibodies/antitoxins for quick response in case of infection by deadly microbes or snake bite.
(b) Antihistamine reduces symptoms of allergy.
(c) Colostrum provides passive immunity, antibodies, IgA to newborn.
(d) Cytokinin-barrier helps in protection of non-infected cells from further viral infection.