Choose the correct answer from the options given below:

1. (A) – (I), (B) – (II), (C) – (IV), (D) – (III)
2. (A) – (I), (B) – (III), (C) – (II), (D) – (IV)
3. (A) – (II), (B) – (I), (C) – (IV), (D) – (III)
4. (A) – (III), (B) – (IV), (C) – (I), (D) – (II)
   

   Ecological Succession Matching: Nudation, Ecesis, Reaction, and Stabilization Explained

   Understanding the stages of ecological succession is crucial for biology exams like CUET PG Botany. This article breaks down List I processes with List II changes and identifies the correct match.

   Correct Answer

   The correct option is (A) – (I), (B) – (II), (C) – (IV), (D) – (III).

   Nudation creates a barren area (I), ecesis establishes species (II), reaction modifies the habitat (IV), and stabilization forms an equilibrium community (III).​

   Key Processes Defined

   Ecological succession follows a sequence starting with disturbance.

   • Nudation: Initial stage where a barren area forms due to events like fire or erosion, lacking life or organic matter.​

   • Ecesis: Successful establishment and growth of pioneer species in the barren habitat after migration.

   • Reaction: Organisms alter the environment through competition and habitat modification, paving way for new communities.​

   • Stabilization: Final climax where the community reaches dynamic equilibrium with its environment.

   Option Analysis

   Each option tests sequence knowledge in primary or secondary succession.

   Option	A	B	C	D	Status
   1	I	II	IV	III	Correct: Matches definitions exactly—nudation (barren), ecesis (establishment), reaction (modification), stabilization (equilibrium).​
   2	I	III	II	IV	Incorrect: Ecesis mismatched with equilibrium (that’s stabilization).​
   3	II	I	IV	III	Incorrect: Nudation not establishment; precedes ecesis.
   4	III	IV	I	II	Incorrect: Disrupts logical order; stabilization is last.​

   Exam Preparation Tips

   Recall succession as: barren area → species setup → change → balance. Practice with CUET-style matching for retention.​