Conjugation in Spirogyra is a form of sexual reproduction where two filaments align, and a conjugation tube forms between cells. The protoplast of one cell transfers through this tube to fuse with the protoplast of another cell, forming a zygospore. The significance of conjugation in Spirogyra is: It introduces genetic variation* into the population, as genetic material from two different parent cells combines. This genetic diversity enhances the species' ability to adapt to changing environmental conditions*. The resulting zygospore is a thick-walled, dormant structure that can survive harsh conditions like drought or extreme temperatures, ensuring the species' survival* until favorable conditions return. What's next? Send 'em!