Question

Match the following columns and select the correct option.

	Column I		Column II
a	6- 15 pairs of gill slits	i	Trygon
b	Heterocercal  caudal fin	ii	Cyclostomes
c	Air Bladder	iii	Chondrichthyes
d	Poison sting	iv	Osteichthyes

• A. a- (ii) b-(iii) c-(iv) d- (i)
• B. a-(iii)b- (iv)c- (i)d- (ii)
• C. a-(iv) b-(ii)c- (iii) d-(i)
• D. a- (i) b-(iv) c-(iii)d- (ii)

Answer 1

The Correct Option is A

This question requires matching terms from Column I with the correct option in Column II related to specific biological concepts.

1. Column I: 6-15 pairs of gill slits: This characteristic is typical of Cyclostomes, which include jawless fishes like lampreys and hagfishes. These organisms often have multiple gill openings.
   • Matching Option: >Cyclostomes (ii) 
2. Column I: Heterocercal caudal fin: This trait is commonly found in Chondrichthyes (cartilaginous fishes), where the upper lobe of the tail is longer than the lower lobe, providing lift when swimming.
   • Matching Option: Chondrichthyes (iii)
3. Column I: Air Bladder: The presence of an air bladder is characteristic of Osteichthyes (bony fishes), enabling them to maintain buoyancy in the water without swimming.
   • Matching Option: Osteichthyes (iv)
4. Column I: Poison sting: This feature is associated with Trygon (commonly known as stingrays), which possess a venomous spine capable of defending against predators.
   • Matching Option: Trygon (i)

Thus, based on the match-up of features, the correct answer is:

• a-(ii) b-(iii) c-(iv) d-(i)

This option accurately aligns the unique biological traits in Column I with the corresponding organisms or classifications in Column II.