What type of gametes does Spirogyra have?
Hint: Sexual reproduction in spirogyra occurs by the fusion of male gamete and female gametes. These two types of gametes i.e. male and female gametes are non-flagellated, non-motile but similar in size.
Are Spirogyra haploid or diploid?
Ectocarpus (class Phaeophyceae) has alternating diploid and haploid vegetative stages, whereas Spirogyra (class Charophyceae) has a haploid vegetative stage, and the zygote is the only diploid cell.
What type of reproduction does Spirogyra?
Spirogyra species can reproduce both sexually and asexually. Asexual, or vegetative, reproduction occurs by simple fragmentation of the filaments. Sexual reproduction occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes.
How do gametes move in Spirogyra?
The sexual reproduction takes place by conjugation in Spirogyra. … After conjugation tube formation, the protoplasmic mass of the male cell rounded to form male gamete and protoplasmic mass of female cell rounded to form female gamete. The male is active donor. It moves towards the female through conjugation tube.
Does Spirogyra have motile gametes?
In Spirogyra, gametes are non-motile and sexual reproduction takes place by conjugation. ( Sargassum belongs to Phaeophyceae group of algae. They are commonly called as ‘brown algae’ and contain photosynthetic pigments chlorophyll a and c.
What is Anisogamy and examples?
Answer: The fusing gametes are different in form, size structure and behaviour as in frog and humans. Such gametes are known as anisogametes, or heterogametes, and their fusion is termed anisogamy, or heterogamy. e.g., Plasmodium, vertebrates.
Why is Spirogyra a protist?
The protists called Spirogyra make up a group of about 400 species of green algae. They get their name because their chloroplasts, which are structures where photosynthesis takes place, form a spiral as you can see.
Are Spirogyra unicellular or multicellular?
Spirogyra is a unicellular green algae that grows in long, filamentous colonies, making it appear to be a multicellular organism. Even though it is technically unicellular, its colonial nature allows us to classify its life cycle as haplontic.
Are Spirogyra autotrophic or heterotrophic?
Spirogyra is an example of a photoautotroph. Heterotrophs are plants that get their daily energy source by feeding on other organisms. Since they lack chlorophyll, they do not have the typical green color associated with plants. Also, they get their food through the environment and other external sources.
Does zygote of Spirogyra undergo meiosis?
Sex cells of both male and female are diploid. They fuse and form tetraploid zygote. This zygote undergoes meiosis, thus forming a diploid zygote. … So, green algae that is the Spirogyra undergoes zygotic meiosis.