Reason: Zygotic meiosis occurs in Spirogyra. … A life cycle characterized by a haploid thallus, and zygotic meiosis is called haplontic life cycle it is also called as haplobiontic because onl a single type of free living individual is involved in the life cycle.
Which type of meiosis occurs in spirogyra?
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.
Does zygotic meiosis occurs in Funaria?
D) Funaria. Hint: In phanerogams, sporadic meiosis is present, in which sporophyte sustains meiosis to form haploid spores. zygotic meiosis is organized in the haplontic life process, in which meiosis arises in the zygote.
In which plant does zygotic meiosis occur?
The zygote undergoes meiotic division to form haploid spores and thus zygotic meiosis occurs in most algae. The haploid spores undergo mitosis to form haploid gametophytes. The gametophyte is the free-living, dominant phase in organisms with a haplontic life cycle. Gymnosperms are higher plants that produce seeds.
Does Pinus show zygotic meiosis?
Note:Zygotic meiosis is a characteristic feature of haploid organisms and cannot take place in diploid or haplodiplontic organisms or organisms with alternate life cycle. Dryopteris and pinus show haplodiplontic life cycle and marchantia show alternate haploid diploid generation.
What is the shape of chloroplast in spirogyra?
Spirogyra has thin and flat ribbon-shaped chloroplasts. These chloroplasts are spirally coiled in the structure.
Which phase of meiosis is the longest?
Prophase I is the longest and arguably most important segment of meiosis, because recombination occurs during this interval.
Why is zygotic meiosis observed in fungi?
The gametic meiosis occurs in some fungi, in which meiosis occurs in the cells of diploid organisms to form haploid gametes. … The diploid phase is represented only by zygote. It shows zygotic meiosis in which meiosis occurs in zygote just after karyogamy. As a result, a diploid cell produces haploid cells.
Does zygotic meiosis occur in angiosperms?
but these male and female gametophytes are short living and dependent. Soon pollen grains produce male gametes and female gametophyte products female gametes inside it’s archaegonia . So that meiosis in gymnosperms is considered as gametic meiosis. # similarly in angiosperms, it is considered as gametic meiosis.
Does Fucus show zygotic meiosis?
Zygotic meiosis is the characteristic of a) Fucus b) Funaria c) Marchantia d) Chlamydomonas. … As Chlamydomonas pertains to kingdom Plantae and division Thallophyta, zygotic meiosis is the characteristic feature observed in them.
Do bryophytes show zygotic meiosis?
Thinking Process All algae except Fucus, Ectocarpus, Dictyota and a few other, show haplontic life cycle or zygotic meiosis, Bryophytes and pteridophytes show haplodiplontic life cycle and undergo sporic meiosis.
What is zygotic meiosis?
Zygotic meiosis is the meiosis that takes place in zygote. Means when zygote act as meiocyte. It takes place in haploid individual during sexual reproduction. e.g. most of Algae and Fungi. … ## meiosis always necessary in sexual reproduction to maintain number of chromosomes in progeny equal to parents.
Do animals have Gametic meiosis?
The gametic life cycle is the reproductive cycle found in animals and some protistans. The term gametic refers to the fact that gametes are the result of meiosis. During the gametic life cycle a reproductive cell produces haploid gametes (sex cells such as egg and sperm) that combine to produce a zygote.
Do algae have alternation of generations?
In algae, fungi, and plants, alternation of generations is common. It is not always easy to observe, however, since one or the other of the generations is often very small, even microscopic.
Are pteridophytes Diplontic?
The haplo-diplontic life cycle is seen in all bryophytes and pteridophytes, along with certain algae. It is also observed in certain algae like Ectocarpus, Polysiphonia and kelps. Define pteridophytes.