Discussion
Given below are two statements :
Statement I : Biological communities increase in diversity as they proceed through seral stages to a climax.
Statement II : In most of the landscapes we see around us, successions are often arrested naturally or by human activities.
In the light of the above statements, choose the most appropriate answer from the options given below :
Answer: A
Both Statement I and Statement II are correct.
In ecological succession, communities change through a series of seral stages towards a stable climax community. In general the number of species and the complexity of the community increase along the way, as pioneer species are replaced by a richer variety of plants and animals.
In practice, most landscapes do not reach climax. Successions are held back, or arrested, by natural disturbances such as fire, flood or grazing, and by human activities such as farming, logging and burning. So Statement II is correct as well.
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