Over the course of evolution, the gametophyte stage has become progressively reduced. Thus, the gametophyte stage is dominant in the more primitive (nonvascular) plants (bryophytes) , whereas the sporophyte is the dominant phase in the life cycle of higher (i.e., vascular) plants.
Are flowering plants gametophyte dominant?
The sporophyte is the dominant generation , but multicellular male and female gametophytes are produced within the flowers of the sporophyte. ... Meiosis within the capsule of the sporophyte yields haploid spores that are released and eventually germinate to form a male or female gametophyte.
Which of the following plants has a dominant gametophyte stage?
The correct answer is 3. “ moss “. Mosses belong to the group, bryophyta. All bryophytes have a dominant gametophyte stage in which structures...
How do you tell if a plant is sporophyte or gametophyte dominant?
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 types of plants have gametophytes?
In bryophytes (mosses, liverworts, and hornworts) , the gametophyte is the most visible stage of the life cycle. The bryophyte gametophyte is longer lived, nutritionally independent, and the sporophytes are attached to the gametophytes and dependent on them.
Are plants diploid dominant?
In bryophytes (mosses and liverworts), the dominant generation is haploid, so that the gametophyte comprises what we think of as the main plant. The opposite is true for tracheophytes (vascular plants) , in which the diploid generation is dominant and the sporophyte comprises the main plant.
What plants have dominant sporophyte?
Unlike nonvascular plants, all vascular plants—including seedless vascular plants —have a dominant sporophyte generation. Seedless vascular plants include clubmosses and ferns. Figure below shows a typical fern life cycle. In the life cycle of a fern, the sporophyte generation is dominant.
What’s the difference between sporophyte and gametophyte?
| Sporophyte Gametophyte | Sporophytes have two sets of chromosomes. These have a single set of chromosomes. | These reproduce asexually. These reproduce sexually. |
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What do plants produce in the sporophyte stage?
In the sporophyte phase a diploid (having two sets of chromosomes) plant body grows and eventually produces spores through meiosis. These spores divide mitotically to produce haploid (having a single set of chromosomes) gamete-producing bodies called gametophytes.
What is male gametophyte?
The functions of the gametophytes are the production of the ‘sperm cells and the female cells, and their union in fertilization. In flowering plants, the pollen grain is the male gametophyte and the embryo sac is the female gametoph yte. The male gametophyte completes its early development within the anther.
What comes first gametophyte or sporophyte?
Plants have two distinct stages in their lifecycle: the gametophyte stage and the sporophyte stage. ... After reaching maturity, the diploid sporophyte produces spores by meiosis, which in turn divide by mitosis to produce the haploid gametophyte. The new gametophyte produces gametes, and the cycle continues.
Does Moss produce sperm?
Some mosses have cups on their tops that produce sperm , these are male plants. The female counterpart has eggs between her overlapping leaves. Water is a necessity for fertilization; as the sperm become mature they have to swim to the eggs to fertilize them.
What is a sporophyte generation?
: the diploid multicellular individual or generation of a plant with alternation of generations that begins from a diploid zygote and produces haploid spores by meiotic division — compare gametophyte.
Are gametophytes male or female?
Male gametophyte is the haploid stage that produces male gametes. It derives from the microspore. Female gametophyte is the haploid stage that produces female gametes. It derives from the megaspore. Male gametophyte is inside the pollen grain while female gametocyte is inside the ovule.
What is a gametophyte in plants?
Gametophyte, in plants and certain algae, the sexual phase (or an individual representing the phase) in the alternation of generations —a phenomenon in which two distinct phases occur in the life history of the organism, each phase producing the other. The nonsexual phase is the sporophyte.
Do all plants have Sporangia?
All plants, fungi , and many other lineages form sporangia at some point in their life cycle. Sporangia can produce spores by mitosis, but in nearly all land plants and many fungi, sporangia are the site of meiosis and produce genetically distinct haploid spores.
