Number of gill slits in cyclostomes is

15-30 pairs

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6-15 pairs

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5-16 pairs

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9-10 pairs

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Solution

The correct option is B
6-15 pairs

Cyclostomes are a class of jawless vertebrates. They have an elongated body which bears 6-15 pairs of gill slits for respiration.

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Similar questions

\begin{matrix} Column I & Column II (a) & 6 - 15 pairs of gill slits & (i) & Trygon (b) & Heterocercal & (i i) & Cyclostomes caudal fin (c) & Air bladder & (i i i) & Chondrichthyes (d) & Poison sting & (i v) & Osteichthyes \end{matrix}

Size of shoe	$4$	$5$	$6$	$7$	$8$	$9$	$10$
No. of pairs sold	$15$	$17$	$13$	$21$	$18$	$16$	$11$

Question 6 (v)

Which of the following pairs represent the same rational numbers:
$\frac{8}{- 5} a n d \frac{- 24}{15}$

	Column-I		Column-II
(a)	Scales and paired fins absent	(i)	Torpedo
(b)	Claspers on pelvic fins of males	(ii)	Cyclostomes
(c)	4 pairs of gills covered with operculum	(iii)	Chondrichthyes
(d)	Electric organs	(iv)	Osteichthyes

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