Q1. What is meant by ecological succession ? How does it occur ? Explain..
Q2.Differentiate between primary and secondary succession ?
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Development of plant community on barren area is called ecological succession or biotic succession. It occurs by the replacement of existing community by new ones, in an orderly sequence in barren area with time due to change in environmental conditions.
Eg: succession on rocks.
Crustose lichen —> foliose lichen —> moss —>herb —>shrub —>forest.
Primary succession :
-occurs in barren land where no previous vegetation was present.
- it is slow and takes 1000(s) of years.
Secondary succession :
-occurs where vegetation was present previously, but was destroyed due to natural or artificial causes like flood, forest fire etc.
-it is comparatively more rapid.
Eg: succession on rocks.
Crustose lichen —> foliose lichen —> moss —>herb —>shrub —>forest.
Primary succession :
-occurs in barren land where no previous vegetation was present.
- it is slow and takes 1000(s) of years.
Secondary succession :
-occurs where vegetation was present previously, but was destroyed due to natural or artificial causes like flood, forest fire etc.
-it is comparatively more rapid.
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