Question

Which of the following about secondary succession is not true?
a.
It occurs in ecosystems without soil.
b.
It occurs in ecosystems that are already established.
c.
It reduces the number of species in an ecosystem.
d.
It is initiated by a disruptive event.

Answer 1

Both (a) and (c) are incorrect statements. Secondary succession occurs where soil is already present (so (a) is false) and, over time, typically increases species richness rather than reduces it (so (c) is false). Statements (b) and (d) are true. If you must pick a single best answer often given on tests, (a) is the most clearly wrong (that describes primary succession).