13.1 - Plants

Question 1

Succession

Answer 1

Gradual change in species composition

…Lichens are pioneer species - first living organisms to colonize an area

Question 2

Primary succession

Answer 2

Occurs in area where there are no plants, animals, or soil. Ex. Lava flow

Question 3

Secondary succession

Answer 3

Occurs after a disturbance in an ecosystem, such as a forest fire or flood. Disturbances can be due to human activity or naturally (ex. lightning strike)

Question 4

Human impact (Negative and positive)

Answer 4

Negative - Interferes with succession and reduces biodiversity. Ex. Deforestation, urbanization, & agriculture

Positive - Selective cutting (instead of clear cutting) can let a community to remain in later stage of succession, maintaining biodiversity