The number of gill slits are maximum in
(a) Cyclostomes (b) Chondrichthyes
(c) Osteichthyes
(d) Larval amphibians
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Explanation:
Trygon - A fish possessing a poison sting is Trygon (e.g. sting-ray).
Cyclostomes - They have 6-15 pairs of gill slits.
Chondrichthyes - They are the cartilaginous fish with heterocercal caudal fins (e.g. sharks).
Osteichthyes - They are the bony fish having air or gas bladder that helps in controlling the buoyancy, this in turn helps to stay at their current water depth without having to waste energy in swimming.
Thus, the correct answer is (D).
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AnswEr :
The number of gill slits are maximum in Cyclostomes. [Option A]
⠀⠀⋆ Additional information ⋆
- Cyclostomes possess 6-14 pairs of gill slits.
- Cyclostomes are generally parasitic as a result they feed on fishes. (In adult stage)
- They're also known as Agnatha as they're only living vertebrates which do not have any true jaws.
- There body is mainly, round and elongated.
- Endoskeleton is cartilaginous & doesn't contain any bones, that is, exoskeleton is absent.
- Heart is two chambered.
- Notochord is present.
- Development is either direct or indirect.
- General examples of Cyclostomes are Lampreys and hagfish.
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