Select the incorrect statements with respect to Cyclostomes: Choose the most appropriate answer from the options given below:
- A and D only
- A and B only
- B and C only
- B and D only
Answer
(4) B and D only
Solution
A: Correct – cyclostomes lack scales and paired fins.
B: Incorrect – as per NCERT, the mouth is circular and without jaws (class Cyclostomata is jawless).
C: Correct – they bear 6–15 pairs of gill slits for respiration.
D: Incorrect – cyclostomes are marine but migrate to fresh water for spawning; after spawning, within a few days, they die.
∴ Incorrect statements: B and D.
Answer: (4)