Question

Meiosis in Spirogyra occurs at the time of

• A. Zoospore formation
• B. Gamete formation
• C. Akinete formation
• D. Germination of zygospore

Answer 1

The correct option is D Germination of zygospore

• In Ulothrix/Spirogyra reduction division (meiosis) occurs at the time of zygospore formation.
• The plant body of Ulothrix and Spirogyra is gametophytic (haploid), they produce zoogametes (n) which fuses to form zygospores (2n) diploid, which is a resting spore.
• The onset of favorable condition zygospore undergoes reductional division, or meiosis to produce zoo- meiospores. Hence, Meiosis in Spirogyra occurs at the time of the Germination of zygospore.
• So, the correct answer is "Germination of zygospore'.