1.1. Define the term succession.

1.2. Figure 1 shows the changes taking place in the abundance of several species as succession occurs in a woodland habitat.

Figure 1

Give the biological terms used to describe the following from Figure 1:

The group of species present at stage 2 of succession  ________

The group of species present at stage 6 of succession ________

1.3. Describe two abiotic changes that take place during the process of succession that lead to the gradually increasing levels of biodiversity shown in Figure 1.

1.4. Explain why the abundance of saplings (stage 5) decreases with the arrival of mature trees (stage 6) in Figure 1.