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What will happen when Spirogyra filament attains considerable length?

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Hint: Matured filament helps in asexual reproduction in the spirogyra and the new organisms that are produced, are genetically and morphologically identical to the parent organism.

Complete answer:
Spirogyra reproduces asexually through a mechanism in which an organism splits at maturity simply in individual parts. Then these individual little pieces grow to form a new organism. This process can also help certain multicellular organisms with simple body organization to reproduce. When a mature spirogyra filament reaches a considerable length then mature spirogyra splits into two or more fragments. Then these fragments develop into an entire organism. This process of asexual reproduction is known as fragmentation.
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Additional Information:
Spirogyra is a green alga found in freshwater environments such as rivers, lakes, and so forth. It is a free-floating organism. They are generally referred to with different names like pond silk and water silk. They have a vegetative structure that is filamentous and unbranched. About 400 species of Spirogyra are found. The genus Spirogyra takes its name from the unusual spiral chloroplast found in algae cells.
Spirogyra is a photosynthetic organism and contributes greatly to the complete fixation of carbon dioxide. They raise oxygen levels in their habitat. It feeds on many aquatic species.

Note: Fragmentation is a benefit for the organism itself because any part of the body will grow into a full organism. Second, it is simple and easy compared with other modes of reproduction. Its drawback is that the offspring produced are their parents' exact copies, with very low chances of variation.