Is Psilotum a sporophyte or gametophyte?
The sporophyte as well as gametophyte of Psilotum (e.g., P. nudum) propagate vegetatively through the production of Gemmae (Fig. 7.15). They are small, multicellular and ovoid structures developing on surface of rhizome (in sporophytic plant body) or prothallus (in the gametophyte).
Are Psilotum sporophyte dependent on gametophyte?
The multiflagellate sperm swim to the egg cells, where they unite to begin the sporophyte generation. Psilophyte gametophytes may even self-fertilize to produce a sporophyte plant. The resulting sporophyte begins its life as a dependent on its parent gametophyte, as in other seedless plants.
What is the unique feature of Psilotum?
The unusual features of Psilotum that suggest an affinity with early vascular plants include dichotomously branching sporophytes, aerial stems arising from horizontal rhizomes, a simple vascular cylinder, homosporous and terminal eusporangia and a lack of roots.
Are pteridophytes gametophyte or sporophyte?
Gametophyte and sporophyte are free-living in pteridophytes only. Of the given options, Pteris is the only pteridophyte. Funaria, Marchantia and Polytrichum are bryophytes in which the sporophyte is dependent on gametophyte.
Is gametophyte of Psilotum is photosynthetic?
Gametophytes are non-photosynthetic, cylindrical, saprophytic, and mycorrhizal; sperm are multiflagellate. The Psilotaceae are distributed worldwide in tropical or warm temperate regions. The two genera are: Psilotum (2–3 spp., tropical and warm regions worldwide) and Tmesipteris (ca.
What is the morphology of Psilotum?
Morphology: ADVERTISEMENTS: The plant body of Psilotum is differentiated into two parts viz., a horizontal underground rhizome and an erect aerial shoot. The rhizome is brownish in colour and dichotomously branched.
How do you know if a plant is gametophyte or sporophyte?
The plant’s haploid phase is called gametophyte and the diploid phase is called the sporophyte.
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| Difference Between Gametophyte and Sporophyte | |
|---|---|
| Sporophytes | Gametophytes |
| Sporophytes have two sets of chromosomes | Gametophytes have a single set of chromosomes |
| Sporophytes reproduce asexually | Gametophytes produce sexually |
What is the gametophyte of pteridophytes?
In pteridophytes, the spores are produced by the sporophytic plant body by meiosis. The spores germinate to form an inconspicuous, small, multicellular, free-living, mostly photosynthetic thalloid gametophyte called as prothallus.
Where does photosynthesis take place in Psilotum?
If Psilotum lacks leaves, where does photosynthesis occur? Photosynthesis takes place in the outer cells of the stem.
What type of stele is present in Psilotum?
The whisk fern, Psilotum is one extant plant having an actinostele. (You’ll meet Psilotum shortly.) plectostele – interconnected regions of xylem are collectively surrounded by a mass of phloem. Club mosses (Lycopodiopsida) often exhibit this type of stele arrangement.
What separates the sporophyte and gametophyte generations?
In seedless vascular plants such as ferns, the sporophyte releases spores from the undersides of leaves. The spores develop into tiny, separate gametophytes, from which the next generation of sporophyte plants grows.
What is the difference between a sporophyte and a gametophyte quizlet?
What is the difference between a Sporophyte and a Gametophyte? Sporophyte phase produces spores, while gametophyte phase produces gametes (egg and sperms). Therefore, sporophyte phase is asexual, while gametophyte phase is sexual.
What is the difference between a sporophyte and gametophyte?
– Male Gametophyte, Female Gametophyte, Examples.
| Difference Between Gametophyte and Sporophyte | |
|---|---|
| Sporophytes | Gametophytes |
| Diploid spore mother cell undergoes meiosis and results in the formation of haploid (n) meiospores | The gametes take part in fertilization or fuse, which gives rise to diploid (2n) zygote |
What are gametophytes vs sporophytes?
The gametophyte represents the sexual phase and sporophyte represents the asexual phase of the plant life cycle. The main difference between gametophyte and sporophyte is that gametophyte is a haploid and is produced by meiosis whereas sporophyte is a diploid and produced by mitosis.
Where are the sporangia in Psilotum?
Psilotum Sporangia
The sporangia are borne on the ends of short lateral branches. Young sporangia of this plant are photosynthetic.
How can you tell the difference between a sporophyte and a gametophyte?
Gametophytes are haploid (n) and have a single set of chromosomes, whereas Sporophytes are diploid (2n), i.e., they have two sets of chromosomes.
What is a sporophyte vs gametophyte?
What are three differences between the gametophyte stage and the sporophyte stage of the plant life cycle?
List three differences between the gametophyte stage and the sporophyte stage of the plant life cycle. Sporophyte is fertilization, gametophyte involves spores, and gametophyte produces the structure.
What is the difference between sporophyte and gametophyte How does this relate to vascular and non-vascular plants?
In vascular plants, the principal generation phase is the sporophyte, which is usually diploid. Only the germ cells and gametophytes are haploid. By contrast, the principal generation phase in non-vascular plants is usually the gametophyte, which is haploid with one set of chromosomes per cell.
What is the life cycle of Psilotum?
Psilotum is a rootless, slender plant, 20-100 cm. in length. The rhizome is covered with hair-like absorbing organs and frequently contains a mycorrhizal fungus. During the course of undergoing repeated dichotomous branching, the tip of any dichotomy comes out of the soil and develops into a sub-aerial shoot.
How do sporophyte and gametophyte stages differ?
What is the relationship between the sporophyte and gametophyte generations?
Diploid sporophyte cells undergo meiosis to produce haploid spores. Each spore goes through mitotic divisions to yield a multicellular, haploid gametophyte. Mitotic divisions within the gametophyte are required to produce the gametes. The diploid sporophyte results from the fusion of two gametes.
Why sporophyte is dominant over gametophyte?
It produces haploid spores that develop into a gametophyte. The gametophyte then makes gametes that fuse and grow into a sporophyte. In many plants, the sporophyte generation is the dominant generation. This means that the sporophyte is larger and lives longer than the gametophyte generation.
Which is more dominant sporophyte or gametophyte?
During the course of evolution, the sporophyte stage has become progressively increased. Thus, in the higher (i.e., vascular) plants the sporophyte is the dominant phase in the life cycle, whereas in the more primitive nonvascular plants (bryophytes) the gametophyte remains dominant.