(a) (i) What is a magnetic field?
(ii) To which class of mixture does each of the following belong?
(α) Smoke
(β) Air
(γ) Bronze

(b) (i) What is plaque in human dentition?
(ii) State the function of chlorophyll in photosynthesis

(c) Identify the scientific principle underlying the operation of each of the following industries
(i) kenkey production
(ii) salt smoking
(iii) fish smoking
(iv) biogas production

(d) (i) What is plant parasite?
(ii) Give one example of a plant parasite