Which of the following is the best definition of secondary succession?

Question

1. Secondary succession is the introduction of plant life on newly formed soils or soils that were previously uninhabited.

2.Secondary succession is the reintroduction of plant life in areas that were previously occupied but have undergone a disturbance.

3. Secondary succession is the destruction of plant life due to human pressures.

4.Secondary succession is the destruction of plant life due to natural pressure such as fire.

5.None of the above.

Answer 1

Secondary succession is a process started by an event (e.g. forest fire, harvesting, hurricane) that reduces an already established ecosystem (e.g. a forest or a wheat field) to a smaller population of species, and as such secondary succession occurs on preexisting soil where as primary succession usually occurs in a place lacking soil.

Answer 2

the only correct answer is #2.  Secondary succession occurs in areas that were previously colonized by plants, but they plants are gone due to some type of disturbance (clearcutting, extreme forest fires, etc.).

Answer 3

Ecosystems undergo secondary succession following some artificial or natural disturbance such as a forest fire or farming.