ECOLOGY
ECOLOGICAL SUCCESSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Volcano wipes out ecosystem that gradually grows back from ash covered soil
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Volcano creates a new island of rock that must break down to form an ecosystem
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Forest fire burns down forest that must bounce back over time
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Tornado destroys a crop that must slowly grow back over time.
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Detailed explanation-1: -What is primary succession? Primary succession is ecological succession that begins in essentially lifeless areas, such as regions in which there is no soil or where the soil is incapable of sustaining life (because of recent lava flows, newly formed sand dunes, or rocks left from a retreating glacier).
Detailed explanation-2: -Primary succession occurs after a volcanic eruption or earthquake; it involves the breakdown of rocks by lichens to create new, nutrient-rich soils. The first species to colonize an area after a major disturbance are called pioneer species; they help to form the new environment.
Detailed explanation-3: -primary succession. Primary succession occurs when new land is formed or bare rock is exposed to provide lifeless habitat for the organisms for the first time. When the volcano erupts, it forms a small island (composed of rocks) that provides lifeless habitat for the organism (for the first time).
Detailed explanation-4: -Secondary succession is usually faster than primary succession because soil and nutrients are already present due to ‘normalization’ by previous pioneer species, and because roots, seeds and other biotic organisms may still be present within the substrate.