Oogamy is a type of sexual reproduction in lower group of plant, e.g., Chlamydomonas, Fucus, Chara and Volvox. In this type of reproduction, the female gamete (egg) is big and non-motile; while male gamete (sperm) is small and motile.
Are gametes motile in Chara?
Chara and Marchantia both species possess on motile gametes and they need means of pollination for fusion.
Which type of reproduction is found in Chara?
Chara reproduces vegetatively and sexually. Vegetative reproduction takes place by tubers, amylum stars and secondary protonemata. The sex organs are a multicellular and jacketed globule or antheridium (male) and nucule or archegonium (female).
Is Chara Isogamous or oogamous?
The sexual reproduction in Chara is of highly advanced oogamous type. The sex organs are macroscopic and complex in organization. The male sex organs are called antheridium or globule and the female oogonium or nucule.
In which organisms gametes are motile?
Gamete Transfer – in majority of organisms, male gametes are motile and females gametes are non-motile, except in fungi and algae in which both gametes are motile. In simple plants like algae, fungi, bryophytes and pteridophytes water is the medium through which male and female gametes moves.
Are gametes non-motile in potato?
stationary in all, except. (1) Sweet potato (2) Marchantia. Male gamete is motile and female gamete is stationary in most of the organisms. …
Is Chara dioecious plant?
Monoecious and dioecious plants
Chara “monoecious ” : Chara is a monoecious organism as both male and female reproductive structures are in the same organisms.
Where is Chara found?
It is found occasionally in the shallows of slow-flowing rivers and in spring seepage areas and known to grow to depths as great as 12 m (see also Chapter 2, Section II. F-2). Often Chara species have a strong odor, hence its common name in North America of skunkweed or muskweed.
What is the life cycle of Chara?
The nucleus of the oospore divides to form 4 haploid daughter nuclei of which, three degenerate. The oospore or zygote germinates to produce haploid protonema. The plant body of Chara is haploid and oospore is the only diploid phase in the life cycle. The life cycle is of haplontic type.
Is Archegonium present in red algae?
D. Archegonium. Hint: In red algae the female sex organ remains attached to the plant even after formation of zygote and forms a new structure called as a cystocarp or carposporophyte.