A) Lizard
B) Snake
C) Scorpion
D) Crocodile
Correct Answer: D
Solution :
The heart in reptiles is incompletely four chambered\[\left( 3\frac{1}{2}\text{chambered} \right)\]having two auricles and a partly divided ventricle. Sinus venosus is present but truncus arteriosis is absent, e.g., lizards, snakes. Crocodiles have a completely four chambered heart like the birds and mammals. These large reptiles are well adapted for an aquatic existence. Scorpions are members of class-Arachnida of phylum-Arthropoda. Scorpions are generally secretive, hiding in burrows or under objects by day and feeding at night. The circulatory system is of open-type i.e, the blood flows in haemocoel instead of blood vessels. One to many chambered usually tubular heart is present.
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