In Ulothrix/Spirogyra/Chlamydomonas, reduction division (meiosis) occurs at the time of

Options

A. gamete formation
B. zoospore formation
C. zygospore germination
D. vegetative reproduction

Answer

C

Explanation

(c) In Ulothrix/Spirogyra, meiosis takes place at the time of zygospore germination. It takes place when (+) and (-) plants/filaments results in the formation of diploid zygote (2x). Zygote is tetraflagellated, it secretes a thick wall and becomes non-motile to form diploid zygospore. Under favourable conditions, zygospore undergoes zygotic meiosis to form motile tetraflagellated zoomeiospores or non-motile aplanomeiospores. Each meiospore (haploid) germinates to new filament of (+) (-) strain.