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  4. Sexual reproduction in Spirogyra is morpho logically characterized by

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Q. Sexual reproduction in Spirogyra is morpho logically characterized by

Chhattisgarh PMTChhattisgarh PMT 2004

Solution:

In Spirogyra sexual reproduction is isogamous. Sexual reproduction is mainly accomplished by conjugation, which involves the fusion of two morphologically identical but physiologically dissimilar gametes. Nitrogen deficient and alkaline environment is favourable for sexual reproduction. The conjugation is of two types-lateral and scalarifonn conjugation. In certain species, the conjugating gametangia are borne on the same filament, called homothallic species, while in others conjugating gametangia are borne on different filaments, called heterothallic species.