Question

Which of the following is a true statement about sea snakes?

• A. They frequently rely on waves of muscle contractions from the lower torso to the head to supplement the work of the heart.
• B. They cannot effectively regulate their blood pressure when placed in seawater and tilted at an angle with the head pointed downward.
• C. They are more likely to have a heart located in close proximity to their heads than are arboreal snakes.
• D. They become acutely vulnerable to the effects of gravitational pressure on their circulatory system when they are placed in a terrestrial environment.
• E. Their cardiovascular system is not as complicated as that of arboreal snakes.

Answer 1

Answer: (D)

They become acutely vulnerable to the effects of gravitational pressure on their circulatory system when they are placed in a terrestrial environment.

The last sentence of the second para shows the effects sea snakes experience when they are removed from water. Their blood pressure at their midpoint and brain drops. Hence, D is correct.

E is not consistent with the contents of the passage. It is incorrect.

The rest of the options are not characteristics of sea snakes. We can discard them.