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Q.

Select the correct difference between Chondrichthyes and Osteichthyes.

 ChondrichthyesOsteichthyes
1.Operculum is presentOperculum is absent
2.Air bladder is presentAir bladder is absent
3.AmmonotelicUreotelic
4.Mouth is ventralMouth is terminal

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a

1

b

2

c

3

d

4

answer is D.

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Detailed Solution

The mouth is ventral in Chondrichthyes. The mouth is mostly terminal in Osteichthyes.

Operculum and air bladder are present in Osteichthyes (absent in Chondrichthyes).

Chondrichthyes are ureotelic. Osteichthyes usually excrete ammonia or TMAO (trimethylamine oxide).

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