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Which of the following animals shows the power of regeneration?
Earthworm
Tick
Planaria
Leech
Planaria
Planaria, a type of flatworm belonging to the phylum Platyhelminthes, exhibits an extraordinary power of regeneration. If a planarian is cut into multiple pieces, each piece can regenerate into a complete, fully functional organism due to the presence of adult stem cells called neoblasts.
Planaria, a type of flatworm belonging to the phylum Platyhelminthes, exhibits an extraordinary power of regeneration. If a planarian is cut into multiple pieces, each piece can regenerate into a complete, fully functional organism due to the presence of adult stem cells called neoblasts.
Think of it like a magical puzzle where every single piece cut out can grow its own missing pieces and transform into a complete, functioning copy of the original puzzle.
Planaria: P for Powerful Regeneration
NeoblastsтЖТBlastemaтЖТCompleteOrganism
Regeneration in Planaria is driven by pluripotent stem cells known as neoblasts distributed throughout its body. When the animal is injured or divided, these neoblasts migrate to the wound site, proliferate to form a blastema (a mass of undifferentiated cells), and subsequently differentiate into all necessary cell types, tissues, and organs to rebuild the missing body parts.
Planaria belongs to the phylum Platyhelminthes (flatworms).
They possess high regenerative capacity and power of morphallaxis.
Neoblasts are the pluripotent stem cells responsible for tissue regeneration.
Earthworms also show limited regeneration, but Planaria is the classic textbook example for exceptional regenerative power.
Allows asexual reproduction (fragmentation).
Enables survival and rapid recovery from severe predator damage or physical trauma.
Energy-intensive cellular process requiring high metabolic activity.
Model organism in stem cell research, tissue engineering, and aging studies.
Option A (Earthworm): Can regenerate a few segments, but cannot regenerate an entire body from any small piece like Planaria.
Option B (Tick): Parasitic arachnid, lacks significant regenerative abilities.
Option C (Planaria): Exhibit extraordinary regenerative power via neoblasts.
Option D (Leech): Annelid with limited healing capacity, not noted for whole-body regeneration.
C is correct тАФ Planaria exhibits extraordinary power of regeneration and can grow into a complete organism from small cut pieces.
In competitive exams like RRB and SSC, questions on asexual reproduction and regeneration frequently feature Planaria and Hydra as primary examples.
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