Which of the following is true about hearts of earthworm?
Correct answer: C. They are present lateral to the oesophagus.
- A. There are 5-7 pairs of heart.
- B. They are present between 1-7th segments.
- C. They are present lateral to the oesophagus.
- D. They pump blood from ventral to dorsal vessel.Standardized & Admissions Tests
Explanation
Earthworms have several pairs of muscular aortic arches, commonly called hearts, located around the oesophagus in the anterior segments. These vessels lie lateral to the oesophagus and connect the dorsal and ventral blood vessels. Students may choose option a because earthworms are often described as having five pairs, but the location given in option c is the more reliable identifying feature and the number can vary with the description used.
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