Is the gametophyte haploid or diploid?
In terms of chromosomes, the gametophyte is haploid (has a single set of chromosomes), and the sporophyte is diploid (has a double set). In bryophytes, such as mosses and liverworts, the gametophyte is the dominant life phase, whereas in angiosperms and gymnosperms the sporophyte is dominant.
Where is the male gametophyte found in flowering plants?
The male gametophyte is formed in the anthers of the stamens, and the female gametophyte is located in the ovules within the pistil. In the anther, four pollen sacs (locules) contain numerous microspore mother cells, each of which undergoes meiosis to produce four microspores in a tetrad (Figure 2A).
Which term describes the male gametophytes of flowering plants?
Are flowering plants Gametophyte or Sporophyte dominant?
Life cycle of an angiosperm, represented here by a pea plant (genus Pisum). The sporophyte is the dominant generation, but multicellular male and female gametophytes are produced within the flowers of the sporophyte. Thus both the embryo and the mature sporophyte are nourished by the gametophyte.
What is Sporophyte generation?
In plants, the sporophyte generation is that phase in their life cycle that begins with the union of two single-celled haploid gametes. In algae with alternation of generations, the sporophyte and the gametophyte are independent organisms. See also: life cycle. gametophyte generation.
Why is alternation of generations useful to plants?
The alternation of generations allows for both the dynamic and volatile act of sexual reproduction and the steady and consistent act of asexual reproduction. When the sporophyte creates spores, the cells undergo meiosis, which allows the gametophyte generation to recombine the genetics present.
What is the meaning of Ectocarpus?
filamentous brown alga
Where is Ectocarpus found?
Ectocarpus is a cosmopolitan marine brown seaweed found mostly as free-floating filaments in intertidal to sublittoral zones of temperate regions. It can also easily grow as epiphytes on other seaweeds.
How does Polysiphonia reproduce?
Hence the asexual reproduction in Polysiphonia take place by means of haploid tetra spores which are formed on tetrasporophytic plant. Alternation of Generation: The life cycle of Polysiphonia exhibits triphasic alternation of generation. In the life cycle three distinct phases occur.
What is Heterotrichous habit?
In green algae, a heterotrichous habit is the most highly developed type of habit. Complete Answer: Heterotrichy means plants, namely prostrate branches and erect branches that produce two types of branches. Branches are positioned only above the ground in prostrate branches, while branches are kept up in erect.
Is Ectocarpus unicellular?
Ectocarpus is (1)Unicellular green algae.
Which type of life cycle is shown by Fucus?
Solution : Fucus shows the diplontic life-cylic.
Is spirogyra a green algae?
Spirogyra, (genus Spirogyra), any member of a genus of some 400 species of free-floating green algae (division Chlorophyta) found in freshwater environments around the world. Named for their beautiful spiral chloroplasts, spirogyras are filamentous algae that consist of thin unbranched chains of cylindrical cells.
Which group of algae is primitive?
Blue green algae are the most primitive group of algae.