Previous year MCQs

Environment & Ecology UPPSC 2024 GS-I
Question

Which of the following is the correct sequence of phases of Biotic succession?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Migration - Ecesis - Reaction- Stabilisat

Detailed Solution:

The correct answer is “Migration - Ecesis - Reaction- Stabilisat”.
Biotic succession refers to the process of change in the species composition of an ecosystem over time. The correct sequence of the phases of biotic succession is: Migration → Ecesis → Reaction → Stabilization

Phase Description
Migration The arrival of propagules (seeds, spores, or organisms) into a new area.
Ecesis The establishment and successful germination or growth of these organisms.
Reaction The modification of the environment by these organisms, making it more or less favorable for other species.
Stabilization (Climax) The final stage where a stable and self-sustaining community is established.

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