The product of conjugation in Spirogyra or fertilization of Chlamydomonas is
zygospore
zoospore
oospore
meiospore
Correct answer: zygospore
Solution
In Spirogyra, conjugation leads to formation of a zygote that develops a thick wall and is called a zygospore. Similarly, fertilization in Chlamydomonas also produces a zygospore as the resting stage.