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Which of the following is NOT true about fragmentation?
It requires the organism to be multicellular.
Each fragment can grow into a complete individual.
It involves breaking of the organism into parts.
It is a form of sexual reproduction.
It is a form of sexual reproduction.
Fragmentation is an asexual mode of reproduction where an organism physically breaks into two or more pieces, each of which regenerates and grows into a complete new individual. Since it does not involve the fusion of gametes or two parent organisms, stating that it is a form of sexual reproduction is incorrect.
Fragmentation is an asexual mode of reproduction where an organism physically breaks into two or more pieces, each of which regenerates and grows into a complete new individual. Since it does not involve the fusion of gametes or two parent organisms, stating that it is a form of sexual reproduction is incorrect.
Imagine cutting a single earthworm or sea star into parts, and each part slowly grows back its missing body to become a whole new organism, similar to how a plant cutting grows into a full plant.
Remember 'A-FRAG': Asexual FRAGmentation тАФ Asexual mode, Fragmentation splits, Re-grows completely, AseXual (not sexual).
In multicellular organisms with simple body organization (such as Spirogyra), mature bodies break apart into smaller fragments upon maturation. Each fragment undergoes rapid cell division and differentiation to reconstruct the missing tissue types, fully regenerating into an independent organism.
Fragmentation is an asexual reproduction method found in simpler multicellular organisms like Spirogyra, sponges, and flatworms.
It relies on the body breaking into fragments, followed by cellular proliferation and tissue regeneration.
Unlike sexual reproduction, fragmentation requires only a single parent and produces genetically identical clones.
Requires only a single parent organism.
Allows rapid population growth in favorable environmental conditions.
Lacks genetic diversity, making populations vulnerable to sudden environmental changes or diseases.
Limited primarily to organisms with relatively simple body organizations.
Natural reproduction mechanism in filamentous green algae like Spirogyra.
Asexual reproduction in invertebrates such as planarians, sea stars, and ribbon worms.
| Feature | Fragmentation (Asexual) | Sexual Reproduction |
|---|---|---|
Gamete Fusion | Absent (No fusion of male and female gametes) | Present (Fusion of sperm/egg or male/female gametes) |
Number of Parents | Single parent | Typically two parents |
Genetic Variation | Offspring are genetically identical clones | Offspring inherit dynamic combinations of genes |
Option A is true because fragmentation typically requires simple multicellular organisms (e.g., Spirogyra). Uni-cellular organisms undergo binary or multiple fission instead.
Option B is true as each fragment possesses the regenerative capability to mature into a full individual.
Option C is true because the process physically involves breaking the parental body into multiple fragments.
D is correct тАФ Fragmentation is an asexual mode of reproduction, making Option D the statement that is NOT true.
Always distinguish between Fragmentation (spontaneous breaking into pieces, e.g., Spirogyra) and Regeneration (accidental regrowth after injury, e.g., Planaria); both are asexual but differ in biological context.
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