AP BIOLOGY

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ECOLOGY

ECOLOGICAL SUCCESSION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A non-native plant is introduced into a divers, mature ecosystem. Assuming that the non-native plant has no natural enemies and that it thrives in the ecosystem, how will it affect the community?
A
The native species will become more like the new plant
B
The number of native species will decrease
C
The number of native species will not be affected at all
D
The native species will become extinct
Explanation: 

Detailed explanation-1: -Why are ecosystems that undergo secondary succession more likely to reach equilibrium faster than ecosystems that undergo primary succession? The beginning soil quality in an ecosystem undergoing secondary succession allows for pioneer species that generate more biomass.

Detailed explanation-2: -A keystone species is an organism that helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.

Detailed explanation-3: -In primary succession pioneer species like lichen, algae and fungi as well as abiotic factors like wind and water start to “normalise” the habitat or in other words start to develop soil and other important mechanisms for greater diversity to flourish.

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