Q: (CDS-I/2020)
question_subject:
Science
question_exam:
CDS-I
stats:
0,32,34,2,32,28,4
keywords:
{'chambered heart': [0, 0, 0, 1], 'salamander': [1, 0, 1, 1], 'animals': [0, 0, 1, 2], 'pigeon': [3, 0, 1, 2], 'scoliodon': [0, 0, 0, 1], 'human being': [1, 0, 0, 6]}
Scoliodon (option 1) is a species of shark, and like all other sharks, it has a two-chambered heart. Pigeons (option 3) and human beings (option 4) are both warm-blooded vertebrates, which means they have a four-chambered heart that ensures complete separation of oxygenated and deoxygenated blood, aiding in maintaining stable body temperatures. However, salamanders (option 2) which are amphibians, do have a three-chambered heart. This heart structure consists of two atria and one ventricle, which results in some mixing of oxygenated and deoxygenated blood - a feature seen in most cold-blooded animals. Therefore, the correct answer is the salamander.