Biology 9-1 0970: Diseases and Immunity Topical Past Paper Questions

(a) Fig. 3.1 shows part of a tree that is infected with a pathogen. Fig. 3.1 (i) Suggest two processes that cannot occur in the infected leaf that can occur in the uninfected leaf in Fig. 3.1. 1 ..... 2 ..... [21] (ii) State the names of two types of pathogen. 1 ..... 2 ..... (ii…

(a) Polio is a viral disease that can cause nerve damage in humans. In one area, polio vaccination began in 1957. Fig. 6.1 shows the number of cases of polio in this area between 1950 and 1970. number of cases of polio Fig. 6.1 (i) Calculate the percentage change in the number of…

(a) Antibiotic resistance is an increasing problem worldwide. Erythromycin is an antibiotic. Fig. 3.1 shows the daily doses of erythromycin per 1000 people over a 13-year period. The number of bacterial infections resistant to erythromycin per 1000 people is also shown. daily dos…