Multiple choice

Which of the following statements is not true?

  1. An organ's metabolic requirements are proportional to the number of blood vessels in it.

  2. Double circulation takes place through a two-chambered heart.

  3. Haemoglobin in a metamorphosed amphibian has a lower affinity for oxygen.

  4. Because of lack of an extensive system of blood vessels, open systems require less energy to build and maintain.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is incorrect. Fishes have a two-chambered heart and only single circulation is seen in them. Double circulation means that blood passes through the heart twice during each cycle of the circulatory process. In animals that have double circulation (blood circulation) systems, the heart has more than two chambers.

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