(a) The causative agent of: (i) Foot and mouth disease is virus (ii) Rinderpest disease is virus (iii) Newcastle disease is virus
(b) Three animals that can be affected by each of the diseases in (a) above are: (i) Foot and Mouth disease - Cattle, Sheep and Goat. (ii) Rinderpest disease - Cattle, Pig, Sheep. (iii) Newcastle disease - Domestic fowl, Turkey, Duck.
(c) Four symptoms of foot and mouth disease are: (i) Formation of blister on the mucous membrane of the mouth (ii) Lameness (iii) Inflammation of the teats and udder (iv) Lesion in the interdigital spaces of the hoofs.
Three symptoms of Rinderpest disease are: (i) High fever (ii) Difficult breathing and loss of weight (iii) Loss of appetite and high mortality. Three symptoms of Newcastle disease are: (i) Nervous disorder or twisting of the neck (ii) Presence of greenish diarrhoea (iii) High mortality and low egg production.