Metamerism — Serial Repetition of Segments in Annelida
📚 Practice Concept📖 NCERT Source
In some animals, the body is externally and internally divided into segments with a serial repetition of at least some organs. For example, in earthworm, the body shows this pattern called metameric segmentation and the phenomenon is known as metamerism.
🎨 Visual Reference
💡 Memory Hook
META = MANY repeated units, inside AND outside
❓ Frequently Asked Questions
What is Metamerism?
Metamerism refers to the phenomenon where an organism's body is divided into repeating units (metameres or segments) both externally AND internally. Each segment contains a repetition of at least some organs — in earthworms, this includes paired nephridia (excretory organs), nerve ganglia, blood vessels, and muscles. This is NOT the same as simple external banding. External appearance alone does not constitute metamerism — the internal organ repetition is equally essential.
What is the key NEET fact about Metamerism?
TRUE metamerism = external + internal organ repetition. Annelida only.
How do you remember Metamerism for NEET?
META = MANY repeated units, inside AND outside
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180of the ReNEET 2026 paper (all subjects) was already in the MedicNEET question bank
MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.
176 of 180 ReNEET 2026 questions traced to MedicNEET17,000+ Biology questionsHindi + English
You just learned this concept. The free app turns it into a daily goal built from your weak topics and brings it back just before you forget it — using active recall and spaced repetition — so it stays till exam day.
Free to start · Hindi + English · 43,000+ questions · NEET 2026 pattern
Related Concepts from Animal Kingdom