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Answered 2014-07-23 04:36:56

alternation of generations

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Which kingdom contains organisms that have a saprophyte and gametophyte stage?

Many algae contain organisms that have a sporophyte and a gametophyte stage. This is called metagenesis of alternation of generations and is a characteristic of Cladophora.


What is the name given to the life cycle of plants which includes a sporophyte generation and a gametophyte generation?

Plants exhibit alternation of generations that includes both diploid and haploid multicellular stages.The multicellular diploid stage is called the sporophyte and haploid stage is called gametophyte.


Mosses have a one or two step life cycle?

Moss has a two-step life cycle that is more appropriately called alternation of generations. In this process a diploid sporophyte produces a haploid diplophyte that then recombines sexually with another gametophyte to produce a sporophyte.


What is female gametophyte?

Embryo sac is the female gametophyte of flowering plants. Situated in the flower. It is dependent on the sporophyte (what we call plant) for nutrition. here the gametophyte is reduced and sporophyte is dominant.In lower plants the female gametophyte is prominent and independent where it can photosynthesize. Usually it is called as a thallus. Here the sporophyte is reduced and the gametophyte is dominant.


Why asexual and sexual ulva plants are called sporophyte and gametophyte?

asexual sporophyte ulva plants is called so, as it produces spores and sexual gametophyte ulva plant is so called as it produces gametes


How does the gametophyte generation of a plant differ from the sporophyte generation?

In most plants, the sporophyte generation is dominant. In fern, for example, the fern itself is the sporophyte. This organism produces spores that fall to the substrate below and grow into a separate organism called a gametophyte. The gametophyte produces sperm and eggs in order to produce a new sporophyte which grows out of the gametophyte's body, destroying it. It is important to note that the gametophyte is haploid and the sporophyte is dploid.


Diploid form in a plant's life cycle?

The diploid form in a plant's life cycle is called the sporophyte. Land plants have a complex life cycle that involves an alternation of generations between a haploid gametophyte and a diploid sporophyte.


What are the two stages of plant life?

Plants have what is called an alternation of generations in their life cycle. The two stages are called the sporophyte generation and the gametophyte generation. The sporophyte generation is diploid (has pairs of chromosomes). It produces spores by meiosis (reduction division), so the spores are haploid (contain only one chromosome from each pair). The spores divide by mitosis to produce a multicellular, haploid gametophyte generation. The gametophyte produces gametes (by mitosis) which fuse during fertilization to form a diploid zygote. This then develops into the sporophyte, completing the life cycle. The plants which we call mosses and ferns are the gametophyte generations. However conifers and flowering plants are the sporophyte generation of their life cycle. This is much easier to understand if you see a diagram.



In plant what is the diploid form called?

A sporophyte is the diploid form and a gametophyte is haploid form.


What are the two stages of the plant life cycle?

The two stages are called the sporophyte generation and the gametophyte generation.


In the alternation of generations life cycle spores grow into gametophyte plants via a process called what?

In the alternation of generations life cycle spores grow into gametophyte plants via a process called mitosis. This can be found by looking at a diagram of the alternation of generations.


What are adaptations of plants?

dermal tissue to prevent water loss, vascular tissue to transport minerals, photosynthesis for energy, and alternation of generations. Alternation of generations is the process of reproducing asexually and sexually switching between generations. The two generations are called gemetophyte which is sexual and sporophyte which is asexual.


Is a spore a single cell organism?

actually, a spore is a reproductive cell of a fungus. it sends spores, similar to seeds, and they land on the ground, and will grow new fungus >> A spore is also the reproductive cell of a plant. Plants exhibit a phenomenon referred to as "alternation of generations," which essentially means that a plant spends half its lifetime as a haploid organism and half its life as a diploid one. The most evolutionarily simple plants have a dominant haploid (called gametophyte) stage, whereas the more complex a plant gets, the more likely it is to have the diploid stage, or sporophyte generation, to be dominant. A spore comes from a meiotic division in this sporophyte generation, producing a haploid cell that could be compared to animal eggs and sperm, yet have to germinate into a gametophyte that will produce sperm and eggs which will be fertilized (become diploid) and will grow into another sporophyte.



What is the sex cell of the male gametophyte called?

it is the sex cell of the male gametophyte.......


When a sex cell divides in mitosis what is the result?

This occurs in the gametophyte generation of plants. Since a sex cell is haploid, the resulting daughter cells would also be haploid. This occurs when the diploid sporophyte generation of a plant produces haploid spores by meiosis. These haploid spores grow into gametophytes by mitosis and cytokinesis. The haploid gametophytes produce haploid gametes, egg and sperm cells, which undergo fertilization, restoring the diploid condition. The zygote that results from this fertilization grows by mitosis and cytokinesis, and is called a sporophyte, and the cycle continues. This is called alternation of generations.


What is alternation of generation?

It is a type of life cycle found in some algae, fungi, and all plants where an organism alternates between a haploid (n) gametophyte generation and a diploid (2n) sporophyte generation. A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte). It once was called hydrogen power. In more simple terms, it is a life cycle in which there is both a multicellular diploid form, and a multicellular haploid form.


How do ferns and mosses differ?

Ferns are pteridophytes. Mosses are bryophytes. Mosses have rhizoids, simple root like structures, ferns have rhizomes or underground stems. Both ferns and mosses reproduce via spores, produced from the sporophyte and gametes from the gametophyte. Ferns; however, are sporophyte dominant and mosses are gametophyte dominant. The main, most noticeable form of the moss is the gametophyte, a haploid structure. The less obvious moss sporophyte is simply a stalk called a seta and spore capsule. On the other hand the most noticeable part of the fern is the sporophyte, which may be huge in the case of tree ferns like Dicksonia and Alsophila/Cyathea. The very much less conspicuous part of a fern life cycle is the nondominant gametophyte, which takes the form of a cardoid prothallus and produces gametes (sperm cells and egg cells) in archegonia and antheridia. Spores are produced in the spore capsules of mosses. In ferns, whole clusters of spore capsules called sporangia are found huddled in structures called sori (singular sorus) on the underside of the fern fronds. Mosses do not have true leaves. The leaf like structures are haploid and unicellularly thick. Ferns have multicellular, diploid fronds.






What is the diploid phase in the life cycle of plants called?

The diploid phase in the plants life cycle is called sporophyte. A zygote is a diploid and after mitosis it will become a sporophyte.



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