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Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYStructural Organisation in Animals1 Mark
MCQ
How many heart does an earthworm possess?
  • A
    $6$ pairs
  • ✓
    $5$ pairs
  • C
    $2$ pairs
  • D
    $1$ pair
✓

Answer

Correct option: B.
$5$ pairs
Earthworm does not have a true heart as it is an invertebrate, but they have five pairs of aortic arches that are referred to as the heart.
These arches are present in the anterior region of the body and they connect ventral and dorsal vessels and pump blood throughout the body.

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