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How does reproduction in spirogyra occur?

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Breaking up of filaments into smaller bits that do not grow into new daughter filament

Divisions of cell into two cells only

Division of a cell into many cells

Formations of a large number of buds

answer is B.

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Detailed Solution

Reproduction in spirogyra involves the division of a cell into many cells. Spirogyra is a genus of green algae that reproduces primarily through asexual reproduction, specifically through fragmentation. In fragmentation, the filamentous cells of the alga separate at certain points, and each fragment develops into a new individual. Spirogyra can also reproduce sexually through conjugation, where two cells come into contact and their protoplasmic strands unite to form a zygote, which then develops into a new organism.

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