Succession is the compositional and structural change of an ecosystem that occurs gradually with time.
The oldest stage of succession shown in the figure is: forest
The reason why the forest is the oldest stage of succession is as follows
When succession occurs in an area in which the existing ecosystem was
destroyed by a disturbance, it is known as secondary succession. Where
the succession is one that a barren land, or lifeless habitat is colonized by
plants and animals, it is known as primary succession
The oldest stage of succession, is the stage where there is stability, and
balance in the biomass, such that the number of species is relatively
constant, or the plateau region of the biomass time graph. It is the climax
stage or the final succession stage, where the development of the
community of organism has reached the maximum based on the
conditions of rainfall, light, and environmental conditions.
Therefore, given that the forest is the most developed stage of the community of organisms in the ecosystem, it is the oldest stage of succession in the ecosystem shown
Learn more about ecological succession here:
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