Biology 9-1 0970: Human Influences on Ecosystems 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…

Fig. 7.1 is a flowchart showing the stages of eutrophication. (a) Complete Fig. 7.1. Fig. 7.1 (b) A scientist obtained a sample of the bacterial decomposers and grew them in a flask. The resources available for bacterial growth in the flask became limiting. The size of the bacter…

(a) A student recorded the information about an aquatic habitat. Fig. 4.1 shows the student's notes. Fig. 4.1 (i) Construct a food web to show the feeding relationships described in Fig. 4.1. Do not draw the organisms. (ii) Complete Table 4.1 using the information in Fig. 4.1 by…