GENERAL KNOWLEDGE

Detailed explanation-1: -There are basically two types of ecological succession that occurs based on the cause of succession which is allogenic and autogenic succession. Allogenic succession is the replacement of any existing community due to any external conditions not by any existing organisms.

Detailed explanation-2: -Allogenic succession: In some cases, the replacement of the existing community is caused largely by any other external condition and not by the existing organism. Such a course is referred to as allogenic succession.

Detailed explanation-3: -Secondary succession is the ecological succession that occurs after the initial succession has been disrupted and some plants and animals still exist. It is usually faster than primary succession as soil is already present, and seeds, roots, and the underground vegetative organs of plants may still survive in the soil.

Detailed explanation-4: -Secondary succession is defined as the development of natural communities on land in the presence of soil but the absence of natural vegetation due to some natural calamities or human-induced activities. One best example of secondary succession is abandoned cropland.