The product of conjugation in Spirogyra or fertilization of Chlamydomonas is

Explanation

The product of conjugation in Spirogyra or fertilization of Chlamydomonas is a zygospore.A zygospore is a thick-walled resting spore that is formed by the fusion of two gametes. Zygospores are resistant to desiccation and other environmental stressors, and they can remain dormant for long periods of time. When conditions are favorable, the zygospore will germinate and produce new individuals. Zoospores are motile spores that are formed by asexual reproduction. Zoospores have flagella that allow them to swim through water. Zoospores are important for dispersal and for colonizing new habitats. Oospores are non-motile spores that are formed by sexual reproduction in oogamous organisms. Oospores are typically surrounded by a thick wall that protects them from the environment. Oospores are important for overwintering and for surviving harsh conditions. Carpospores are non-motile spores that are formed by sexual reproduction in red algae. Carpospores are typically produced in clusters and are dispersed by water currents. Carpospores are important for dispersal and for colonizing new habitats. Therefore, the correct answer is zygospore.