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Q26
(UPPCS/2024)
Environment & Ecology › Ecology & Ecosystem Basics
Which of the following is the correct sequence of phases of Biotic succession ?
Result
Your answer:
—
·
Correct:
D
Explanation
Biotic or ecological succession is the process by which the structure of a biological community evolves over time. According to the classical model of succession (Clementsian succession), the process involves several distinct stages:
- Nudation: Development of a bare area without any life form.
- Invasion: This includes Migration (dispersal of seeds, spores, or propagules to the bare area) followed by Ecesis (successful establishment and germination of the species in the new environment).
- Competition and Coaction: As the number of individuals increases, they compete for space and nutrients.
- Reaction: The established species modify the environment (e.g., soil composition, light availability), often making it more suitable for new species.
- Stabilisation: The community reaches a final, stable state known as the climax community.
Thus, the correct sequence is Migration → Ecesis → Reaction → Stabilisation.
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