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Question
A rocky barren land after some time changes into fertile rich, crop yielding land. Which sequence might have occured?
A rocky barren land after some time changes into fertile rich, crop yielding land. Which sequence might have occured?
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Solution
The correct option is B Lichens, mosses, herbs, shrubs
The species that invade a bare area are called as pioneer species. In primary succession on rocks these are usually lichens, which are able to secrete acids to dissolve rock, helping in weathering and soil formation. These later pave way to some very small plants like Bryophytes, which are able to take hold in the small amount of soil. They are, with time, succeeded by bigger plants, and after several more stages, ultimately a stable climax forest community is formed. The climax community remains stable as long as the environment remains unchanged. With time the xerophytic habitat gets converted into a mesophytic one.
The species that invade a bare area are called as pioneer species. In primary succession on rocks these are usually lichens, which are able to secrete acids to dissolve rock, helping in weathering and soil formation. These later pave way to some very small plants like Bryophytes, which are able to take hold in the small amount of soil. They are, with time, succeeded by bigger plants, and after several more stages, ultimately a stable climax forest community is formed. The climax community remains stable as long as the environment remains unchanged. With time the xerophytic habitat gets converted into a mesophytic one.
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