All vertebrates possess a ...$A$.... Fishes have a ...$B$... chambered heart with atrium and ventricles. Amphibians and reptiles have a ...$C$... chambered heart. Birds and mammals have ...$D$... chambered heart.
Choose the correct option.
Choose the correct option.
- A$A-$ muscular chambered heart,$B- 3, C- 2, D- 4$
- B$A-$ muscular chambered heart,$B- 2, C- 3, D- 4$
- C$A-$ muscular chambered heart,$B- 4, C- 3, D- 2$
- D$A-$ muscular chambered heart,$B- 3, C- 4, D- 2$
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When the heart of a frog is removed from the body,it continues to beat for some time. Select the correct statement$(s)$ from the following:
$(i)$ The frog is a cold-blooded animal.
$(ii)$ The frog does not have a heart-based circulatory system.
$(iii)$ The heart has myogenic properties.
$(iv)$ The heart is self-excitable.
$(i)$ The frog is a cold-blooded animal.
$(ii)$ The frog does not have a heart-based circulatory system.
$(iii)$ The heart has myogenic properties.
$(iv)$ The heart is self-excitable.
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