Which of the following statement(s) is correct about Chondrichthyes?
(I) They have two chambered heart, with one auricle and one ventricle
(II) They are poikilothermic
(III) They have separate sexes, males bear claspers
(IV) They have bony endoskeleton

II, III, IV

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I, III,IV

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I, II, III

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I, II, III, IV

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Solution

The correct option is C I, II, III
Chondrichthyes are fishes with cartilaginous endoskeleton and are cold blooded animals ( Poikilothermic- they are unable to regulate the body temperature).

They have a venous heart which is a two chambered heart with one atrium and one ventricle which has single circulation.

Respiration is with the help of gill slits (5-7 pairs) which are not covered by the operculum. Sexes are separate and males bear claspers. Examples are sharks (Carcharodon, Scoliodon) and rays (Torpedo, Trygon).

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Which of the following statement(s) is correct about Chondrichthyes? (I) They have two chambered heart, with one auricle and one ventricle (II) They are poikilothermic (III) They have separate sexes, males bear claspers (IV) They have bony endoskeleton

Which of the following statement(s) is correct about Chondrichthyes?
(I) They have two chambered heart, with one auricle and one ventricle
(II) They are poikilothermic
(III) They have separate sexes, males bear claspers
(IV) They have bony endoskeleton