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Select the incorrect statements with respect to Cyclostomes:     (NEET 2022 Phase 2)
(a) They lack scales and paired fins.
(b) They have circular mouth with jaws.
(c) They bear 6-15 pairs of gills.
(d) They migrate to deep sea for spawning.
Choose the most appropriate answer from the options given below:
  • a)
    (a) and (d) only
  • b)
    (a) and (b) only
  • c)
    (b) and (c) only
  • d)
    (b) and (d) only
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Select the incorrect statements with respect to Cyclostomes: (NEET 2...
Understanding Cyclostomes
Cyclostomes, a group of jawless fish that includes lampreys and hagfish, exhibit unique characteristics that set them apart from other vertebrates. Let's analyze the statements provided about them.
Statement Analysis
  • (a) They lack scales and paired fins.
    This statement is correct. Cyclostomes do not possess scales or paired fins, which distinguishes them from many other fish species.
  • (b) They have circular mouth with jaws.
    This statement is incorrect. Cyclostomes have a circular mouth, but they lack true jaws. Instead, they have a sucker-like mouth, which is characteristic of their feeding mechanism.
  • (c) They bear 6-15 pairs of gills.
    This statement is correct. Cyclostomes typically possess multiple pairs of gills for respiration.
  • (d) They migrate to deep sea for spawning.
    This statement is incorrect for most cyclostomes. While some species may have specific spawning behaviors, many migrate to freshwater or nearshore environments rather than the deep sea.

Conclusion
Based on the analysis:
- Statements (b) and (d) are incorrect. Cyclostomes do not possess jaws and do not typically migrate to the deep sea for spawning.
- Therefore, the correct answer is option 'D', which identifies the incorrect statements as (b) and (d).
This understanding helps clarify the biological traits of cyclostomes, distinguishing them from other fish groups.
Free Test
Community Answer
Select the incorrect statements with respect to Cyclostomes: (NEET 2...
Statement (a): They lack scales and paired fins.
  • Analysis: This statement is correct. Cyclostomes, which include lampreys and hagfishes, do indeed lack scales and paired fins, which are common characteristics of these jawless fishes.
Statement (b): They have circular mouth with jaws.
  • Analysis: This statement is incorrect. Cyclostomes have a circular mouth, but they do not have jaws; their mouth is instead adapted for sucking or latching onto prey.
Statement (c): They bear 6-15 pairs of gills.
  • Analysis: This statement is correct. Cyclostomes have multiple pairs of gill pouches, which is typical for their respiratory system.
Statement (d): They migrate to deep sea for spawning.
  • Analysis: This statement is incorrect. Cyclostomes, particularly lampreys, are known to migrate from the sea into freshwater rivers for spawning, not to the deep sea.
Conclusion: Based on the analysis, the incorrect statements are (b) "They have circular mouth with jaws." and (d) "They migrate to deep sea for spawning."
Therefore, the correct choice is: D. (b) and (d) only
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