Question
Biology Question on Kingdom Plant
In Ulothrix/Spirogyra, reduction division (meiosis) occurs at the time of
A
gamete formation
B
zoospore formation
C
zygospore germination
D
vegetative reproduction.
Answer
zygospore germination
Explanation
Solution
In Ulothrix/Spirogyra reduction division (meiosis) occurs at the time of zygospore formation. Plant body of Ulothrix and Spirogyra, is gametophytic (haploid), they produce zoogametes (n) which fuses to form zygosporic (2n) diploid, which is a resting spore. Onset of favourable condition zygospore undergoes reductional division, or meiosis to produce zoo- meiospores.