Question

In Ulothrix, reduction division takes place at the time of

• A. Germination of zygospore
• B. Formation of zygospores
• C. Formation of gametes
• D. Formation of zoospores

Answer 1

The correct option is A Germination of zygospore

Ulothrix is one of the green algal species that exhibit zygotic meiosis. It is a filamentous algae. It has two types of filaments denoted as + strain and - strain. These strains fuse to form a tetraflagellated diploid zygote.
Zygote undergoes transformation by developing a thick coat around it which also encloses the flagella, becoming non-motile. At this stage, it is called zygospore.
Zygospore undergoes meiosis to form haploid motile zoomeiospores or non-motile aplanomeiospores. Each of these haploid spores gives rise to new filament of Ulothrix.