ECOLOGY
ORGANISMS AND THE ENVIRONMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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primary starts with grass and weeds, secondary starts with mosses
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primary starts with forest fire, secondary starts with volcano
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primary starts with a volcano, secondary starts with a forest fire
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Lichens and moss in primary, and grasses/ ferns in secondary
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Detailed explanation-1: -Primary succession occurs in an area that has never before been colonized. Pioneer species include bacteria and lichens that can grow on bare rock and help make soil. Secondary succession occurs in a formerly inhabited area that was disturbed.
Detailed explanation-2: -The first organisms to appear in areas of primary succession are often mosses or lichens. These organisms are known as pioneer species because they are the first species present; pioneer species must be hardy and strong, just like human pioneers.
Detailed explanation-3: -Lichens are typically the first organisms to colonize bare rock. They are therefore the pioneer species in primary succession. Many organisms require soil before they can colonize an area. Lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process.
Detailed explanation-4: -Acids that break down the rock and start the process of soil formation are secreted by lichens that colonize bare rock. They provide organic matter to the soil when they die. Mosses will then colonize the thin soil; the soil thickens further when moses die, other hardy species to colonize that land.