AP BIOLOGY

ECOLOGY

ECOLOGICAL SUCCESSION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
During ecological succession, a grass community is replaced by a community of shrubs. This change is primarily a result of the fact that the grass community-
A
evolves over several decades into a new species bushes that dominates the ecosystem
B
was no longer able to produce viable offspring which could live in this ecosystem
C
removed nutrients from the soil until only shrubs were able to grow
D
modified its environment making it more suitable for the shrub community
Explanation: 

Detailed explanation-1: -Ecological succession is the process by which the mix of species and habitat in an area changes over time. Gradually, these communities replace one another until a “climax community”-like a mature forest-is reached, or until a disturbance, like a fire, occurs. Ecological succession is a fundamental concept in ecology.

Detailed explanation-2: -The process of one community replacing another as a result of changing abiotic and biotic factors is called ecological succession.

Detailed explanation-3: -As new plant species take hold, they modify the habitat by altering such things as the amount of shade on the ground or the mineral composition of the soil. These changes allow other species that are better suited to this modified habitat to succeed the old species.

Detailed explanation-4: -In secondary succession, a previously occupied area is re-colonized following a disturbance that kills much or all of its community. A classic example of secondary succession occurs in oak and hickory forests cleared by wildfire.

There is 1 question to complete.