What are the two types of Gametophytes?

What are the two types of Gametophytes?

These spores develop into two distinct types of gametophytes; one type produces sperm and the other produces eggs. The male gametophyte develops reproductive organs called antheridia (produce sperm) and the female gametophyte develops archegonia (produce eggs).

What is an example of a gametophyte?

The fern you imagine when you think of Jurassic Park or a forest floor is a gametophyte. The graceful, fringed leaves are haploid – meaning they have only one set of chromosomes and produce sex cells through mitosis, like all gametophyte plants.

Are seeds haploid or diploid?

The seeds produced by the sporophyte contain: A seed coat of diploid tissue from the original diploid parent. A developing diploid embryo inside which began as a zygote after fertilization of the haploid egg by a haploid sperm. The sperm is likely to have come from a different plant.

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How do spores reproduce?

Spore. … Spores thus differ from gametes, which are reproductive cells that must fuse in pairs in order to give rise to a new individual. Spores are agents of asexual reproduction, whereas gametes are agents of sexual reproduction. Spores are produced by bacteria, fungi, algae, and plants.

Do Sporophytes produce gametes?

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.

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.

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Which Moss generation is 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 is a Microgametophyte?

microgametophyte. [ mī′krō-gə-mē′tə-fīt′ ] The male gametophyte that develops from the microspores of heterosporous plants. The pollen grains of gymnosperms and angiosperms are microgametophytes. See more at gametophyte pollination.

Do Ferns have seeds?

Ferns belong to an ancient group of plants that developed before flowering plants, and they do not produce flowers and therefore do not produce seed. Ferns reproduce by means of spores, a dust-like substance produced in capsules called sori on the underside of the fern leaf, or frond.

Do gymnosperms have seeds?

Angiosperms, also called flowering plants, have seeds that are enclosed within an ovary (usually a fruit), while gymnosperms have no flowers or fruits, and have unenclosed or “naked” seeds on the surface of scales or leaves. Gymnosperm seeds are often configured as cones.

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What is the gametophyte stage?

plant stage. 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. Gametophyte.

Are bryophytes haploid or diploid?

A bryophyte spore is haploid. A haploid cell has one set of chromosomes, a diploid cell has two. In humans, the egg and sperm cells are haploid.

What are the three groups of bryophytes?

The three bryophyte clades (which may be treated as divisions) are the Marchantiophyta (liverworts), Bryophyta (mosses) and Anthocerotophyta (hornworts). The vascular plants or tracheophytes form a fourth, unranked clade of land plants called the "Polysporangiophyta".

Is a seed a mature ovule?

Ovule, plant structure that develops into a seed when fertilized. A mature ovule consists of a food tissue covered by one or two future seed coats, known as integuments. … Each ovule is attached by its base to the stalk (funiculus) that bears it.