Bryophyte Generations The haploid stage, in which a multicellular haploid gametophyte develops from a spore and produces haploid gametes, is the dominant stage in the bryophyte life cycle. The mature gametophyte produces both male and female gametes, which join to form a diploid zygote.
What is the life cycle of bryophytes called?
The life cycle of bryophytes consists of an alternation of two stages, or generations, called the sporophyte and the gametophyte. Each generation has a different physical form.
What is the dominant stage of life cycle?
The dominant part of the life cycle, i.e., the plant that is recognized as a fern, represents the sporophyte generation. The gametophyte generation includes the phase of the life cycle between the formation of spores by meiosis and fertilization and formation of the zygote.
What is the dominant phase in the life cycle of a bryophyte How does this compare to the dominant phase of the rest of the land plants?
How does this compare to the dominant phase of the rest of land plants? – The dominant phase of bryophytes is the GAMETOPHYTE phase. – The dominant phase in other land plants is the sporophyte. They have shorter gametophyte phases.
Which stage of the bryophyte life cycle is the dominant photosynthetic structure?
In bryophytes (liverworts, hornworts, and mosses), the gametophyte stage is dominant. The leafy green structures we recognize (Figure below) are haploid, and perform most of the photosynthesis.
What’s the dominant generation in bryophytes?
In bryophytes, such as mosses and liverworts, the gametophyte is the dominant life phase, whereas in angiosperms and gymnosperms the sporophyte is dominant. The haploid phase is also dominant among fungi.
Which phase is dominant in the life cycle of bryophytes and Pteridophytes?
In Bryophytes, the dominant phase is the gametophyte and in Pteridophytes, it is the sporophyte.
Why is gametophyte the dominant phase in bryophytes?
Gametophyte is a haploid multicellular adult stage in a bryophyte’s life cycle. It bears male reproductive structure (antheridia) and female reproductive structure called archegonia ,and thus produce haploid gametes antherozoids (male gamete) and egg cell (female gamete) respectively.
What are the two phases in the life cycle of bryophytes?
The bryophytes exist in two phases – gametophyte and sporophyte.
Are bryophytes gametophyte or sporophyte dominant?
In a bryophyte, all the vegetative organs belong to the gametophyte, which is the dominant and most familiar form; the sporophyte appears for only a short period. The sporophyte is dependent on the gametophyte and remains permanently attached to it in order to gain nutrition and protection.
Which stage bryophytes spend the majority of the life cycle?
D is correct. All bryophytes have a dominant gametophyte stage in their life cycle. During this stage, the plant is haploid and the sex organs that produce the gametes are developed. Bryophytes are unique compared to many other plant species in that they remain in this stage for long periods.
Which is the dominant part of the marchantia life cycle the sporophyte or gametophyte?
Similarly to other bryophytes, the gametophyte generation dominates the life cycle and produces the main plant body (thallus). This haploid gametophyte starts as a unicellular spore that germinates and forms an initial short filamentous ‘protonema’ with rhizoids.
Where does meiosis occur in life cycle of bryophytes?
Meiosis takes place in the tiny sporophyte stage of bryophytes, which are attached to and dependent on the much larger gametophyte stage. The sporophytes create spores by meiosis in the sporangium, which are dispersed by wind and water to form new gametophytes.
What do you mean by dominant generation?
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 generation is well developed in bryophytes?
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.
Do bryophytes have alternation of generations?
The bryophytes show an alternation of generations between the independent gametophyte generation, which produces the sex organs and sperm and eggs, and the dependent sporophyte generation, which produces the spores.
Which is the dominant phase in Bryophytes Mcq?
Solution: The first cell in a sporophyte generation is the diploid zygote, while the first cell in the gametophyte stage is the haploid spore. Solution: Bryophytes have a dominant gametophyte phase on which the adult sporophyte is dependent for the nutrition.
Which is the dominant phase in sporophyte?
In gymnosperms,pteridophytes and angiosperms, the sporophytic phase is dominant.Question : The sporophyte is the dominant phase in. Question The sporophyte is the dominant phase in Question Video Duration 1m25s.
Which one is dominant phase in life cycle of Pteridophytes?
The fertilized egg or zygote undergoes the division of mitosis and forms the different parts like stems, roots, and sporophyte, and later spores are formed again through meiosis and spread by the dispersion, and, again the life cycle continues, so the sporophyte is the dominant phase of pteridophyte.
What is dominant and independent phase of bryophytes?
It is clear that the gametophyte is the dominant phase in the life cycle of a bryophyte in every aspect. The gametophyte is independent and photosynthetic. It is much larger in size compared to the sporophyte.
How is gametophyte a dominant phase in the life cycle of?
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.
Which phase in the plant life cycle is dominant in the Monilophytes?
The diploid sporophyte is the dominant phase of the life cycle, while the gametophyte is an inconspicuous, but still-independent, organism.
What is the dominant phase for seedless vascular plants?
In seedless vascular plants, the diploid sporophyte is the dominant phase of the life cycle. The gametophyte is now less conspicuous, but still independent of the sporophyte.
Which cell in the life cycle of bryophytes undergo meiosis?
Life cycle of a moss (genus Polytrichum). The sporophyte generation is dependent on the photosynthetic gametophyte for nutrition. Cells within the sporangium of the sporophyte undergo meiosis to produce male and female spores, respectively.
What is predominant stage?
The predominant stage of the life cycle of a moss is the gametophyte which in turn comprises 2 stages – protonema stage and leafy stage.
Which of the bryophytes has the most highly developed sporophyte?
Anthoceropsida is best group in bryophytes and have highly evolved gametophyte and sporophyte.
Are bryophytes Monoecious or dioecious?
All bryophytes are homosporous and monoecious but Marchantia is an exception as it is dioecious. The terms monoecious and dioecious in homosporous plants refers to the gametophytes. A monoecious moss species has archegonia and antheridia on the same gametophyte.
Are bryophytes unicellular or multicellular?
Spores of bryophytes are generally small, 5–20 micrometres on the average, and usually unicellular, although some spores are multicellular and considerably larger.
Which of these was the dominant plant group at the time that dinosaurs were the dominant animals?
Lesson 9 HW Question Answer Which of these was the dominant plant group at the time that dinosaurs were the dominant animals? gymnosperm _____ are an example of seedless vascular plants. fern The living plants that are most similar to the first plants to bear gametangia are the _____. bryophytes.
What is the dominant phase in the life cycle of an angiosperm?
Angiosperms are vascular plants, and all vascular plants have a life cycle in which the sporophyte phase (vegetative body) is the dominant phase and the gametophyte phase remains diminutive. In the nonvascular plants, such as the bryophytes, the gametophyte phase is dominant over the sporophyte phase.
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