ECOLOGY
ECOLOGICAL SUCCESSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primary succession starts with soil.
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Secondary succession start with bare rock.
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Primary succession starts with bare rock, with lichens and moss.
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Fire is an example of primary succession.
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Detailed explanation-1: -In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area previously occupied by living things is disturbed-disrupted-then recolonized following the disturbance.
Detailed explanation-2: -This process is called primary succession. It begins with organisms such as lichens that can live and grow very slowly on bare rock. Lichens (see the Fungi station) break down rock by secreting acids.
Detailed explanation-3: -Lichens are considered as pioneer species in primary succession on rocks because they can easily grow on rocks where other plants cannot grow. They produce oxalic acid which induced the weathering of rocks and thus soil is formed.
Detailed explanation-4: -Primary succession occurs in places that have never been occupied by a community, like this lava flow. Pioneer communities help enrich the soil. As generations of the mosses or lichens die, their remains decompose and are added to the soil. The soil is then able to support a greater variety of plant life.
Detailed explanation-5: -Primary succession occurs where no ecosystem has existed before. It is a very slow process because it begins on bare rock. A glacier that retreats leaves behind no soil.