Choose the correct answer from the options given below:

1. A-IV, B-III, C-I, D-II
2. A-IV, B-I, C-III, D-II
3. A-I, B-II, C-III, D-IV
4. A-II, B-III, C-I, D-IV

   The correct matching for Q.47 is A-IV, B-III, C-I, D-II.

   Detailed Matching Explanation

   A. Gloger’s rule → IV. Effect on coloration: States that animals in warmer, humid climates have darker pigmentation (melanin) for UV protection/thermoregulation, while those in cold/arid areas are paler.​

   B. Bergmann’s rule → III. Size of animal and body parts: Within species, body size increases in colder climates (lower surface:volume ratio conserves heat); smaller in warmer areas.

   C. Allen’s rule → I. Tail, snout, ear and legs of mammals: In colder climates, endotherms evolve shorter appendages (ears, tails, limbs) to minimize surface area and heat loss.​

   D. Rensch’s rule → II. Bird wings: Within bird species, males have relatively larger wings than females (often linked to sexual dimorphism and display/flight differences).​

   Incorrect Options Explained

   A-IV, B-I, C-III, D-II: Wrong—Bergmann’s not about appendages (Allen’s domain); confuses size rules.​

   A-IV, B-I, C-III, D-II: Duplicate/wrong—Bergmann mismatched to appendages.​

   A-I, B-II, C-III, D-IV: Wrong—Gloger’s not appendages; Bergmann not wings; Rensch not coloration.​

   A-II, B-III, C-I, D-IV: Wrong—Gloger’s not wings; Rensch not coloration.​

   Introduction
   Match List I with List II on ecogeographical rules pairs Gloger’s rule (A-IV: coloration), Bergmann’s rule (B-III: animal size), Allen’s rule (C-I: mammal appendages), and Rensch’s rule (D-II: bird wings). These 19th-century principles explain climate-driven morphological evolution in endotherms.

   Rules Breakdown

   • Gloger’s Rule: Darker fur/skin in humid tropics vs. pale in deserts (melanin adaptation).​

   • Bergmann’s Rule: Larger bodies poleward (e.g., moose bigger northward).​

   • Allen’s Rule: Shorter ears/tails in Arctic mammals (fox vs. fennec).​

   • Rensch’s Rule: Greater wing dimorphism in male birds.​

   Rules Matching Table

   List I	List II	Adaptation Example
   A. Gloger	IV. Coloration	Dark squirrels in tropics ​
   B. Bergmann	III. Size	Bigger bears northward ​
   C. Allen	I. Appendages	Short-eared Arctic fox ​
   D. Rensch	II. Bird wings	Male bird wing size ​

   Exam Relevance

   These rules test biogeography/climate adaptation patterns in NEET/CSIR-NET; remember “Color-Size-Appendages-Wings” sequence.​