Combined Science: Trilogy 8464: B7.Ecology Topical Past Paper Questions

Otters are mammals that live in river ecosystems. Figure 5 shows an otter. Figure 5 Otters are an important species for the stability of the river community. Describe two ways animal species may be important for the stability of a whole community. [2 marks] Sewage was accidentall…

Figure 1 shows a river next to a field. Figure 1 1 Describe a method to investigate how the distance from the river affects the number of different plant species in the field. You should explain how to use a transect in your method. [4 marks] Students used a valid method to inves…

Scientists investigated the effect of soil nitrate ion concentration on the yield of corn. This is the method used. 1. Corn plants were grown in a large box of soil. 2. The soil nitrate ion concentration in the box was kept at 0 parts per million (ppm). 3. All the corn from each…