How many pairs of gill slits do members of the class Cyclostomata have?

How many pairs of gill slits do members of the class Cyclostomata have?
  1. 6
  2. 15
  3. 4
  4. 9

Solution

Cyclostomes have an elongated body bearing 6-15 pairs of gill slits for respiration.

Asked in: NCERT

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