Life cycle of an angiosperm, represented here by a
pea plant
(genus Pisum). The sporophyte is the dominant generation, but multicellular male and female gametophytes are produced within the flowers of the sporophyte.
What does it mean if a plant is sporophyte dominant?
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
.
What kind of spores do Homosporous plants produce?
Homosporous plants produce
one type of spore
which develops into a gametophyte (1n) with both male and female organs. Heterosporous plants produce separate male and female gametophytes, which produce sperm and eggs, respectively.
What plants have a Homosporous life cycle?
plants. A homosporous life history occurs in
nearly all bryophytes and in most pteridophytes (lower vascular plants)
. It is characterized by morphologically identical spores that germinate to produce bisexual (both male and female) gametophytes in pteridophytes but either bisexual or, more usually, unisexual…
Are sporophytes unicellular or multicellular?
A sporophyte (/ˈspɔːr. əˌfaɪt/) is the diploid
multicellular
stage in the life cycle of a plant or alga. It develops from the zygote produced when a haploid egg cell is fertilized by a haploid sperm and each sporophyte cell therefore has a double set of chromosomes, one set from each parent.
Why are ferns sporophyte dominant?
In vascular plants, the sporophyte generation is dominant. 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 type of life cycle do all plants have?
All plants have a life cycle with
alternation of generations
. Plants alternate between diploid sporophyte and haploid gametophyte generations, and between sexual reproduction with gametes and asexual reproduction with spores.
What do all plant life cycles have in common?
All life cycles have a few things in common:
they start with seeds, eggs, or live birth, then involve multiple steps including reproduction, and then they end in death
. The cycle repeats for millions of years.
What is the advantage of having a dominant sporophyte?
Sporophytes – a multi-celled, diploid plant body that gives rise to spores. They are the dominant form in most land plants. By mitosis spores produce gametophytes. Advantage of a dominant sporophyte was
fertilization and dispersal of new/next generation timed with environmental conditions
.
Are ferns sporophyte dominant?
In higher plants like ferns and fern allies,
the sporophyte stage is dominant
. Gametophytes produce gametes (sperm and eggs) in a special structure called a gametangium (-ia), while sporophytes produce spores in a special structure called a sporangium (-ia).
What’s the difference between sporophyte and gametophyte?
Furthermore,
sporophytes are diploid, meaning they have two sets of chromosomes. Gametophytes, on the other hand, are haploid and have only one set of chromosomes
. This is the most important distinction between sporophyte and gametophyte.
What is the function of the sporophyte?
The basic function of the sporophyte is
to create spores
– that much is known already. The spores, in turn, produce the gametophytes that give rise to the male and female gametes through the process of meiosis.
What is the difference between H * * * * * * * * * * and heterosporous?
A main difference between homosporous and heterosporous pteridophytes is that
homosporous pteridophytes produce only one type of spores, which are small in size while heterosporous pteridophytes produce two types of spores; the small microspores and the large megaspores
.
What is sporophyte and gametophyte in plants?
The multicellular diploid plant structure is called the sporophyte, which produces spores through meiotic (asexual) division. The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes.
Is a plant embryo a gametophyte or sporophyte?
Thus, the zygote is diploid. The zygote is the first cell of the next generation of sporophyte. The zygote begins to divide to produce a multicellular sporophyte embryo.
The embryo is an immature sporophyte
that is nourished (fed) by the gametophyte.
Are gymnosperms sporophyte dominant?
Like all the vascular plants,
Gymnosperms too have a sporophyte-dominant life cycle
. They spend most of their life cycle with diploid cells.
Are seedless vascular plants sporophyte dominant?
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.
Which phase of life cycle is dominant in the individuals of angiosperms?
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.
What phase of the fern life cycle is dominant?
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.
Why are vascular plants sporophyte dominant?
It is beneficial to have the sporophyte generation dominant in vascular plants because
the sporophyte generation has the vascular tissue
. 10. … The moss sporophyte is dependent on the gametophyte, which is the dominant generation.
Are bryophytes sporophyte dominant?
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
.
Do all plants have a life cycle?
All plants have a life cycle
and this cycle is very important to agriculture. Because a major source of our food is from plants, we can classify them by their life cycle. Crops can be sorted into annuals, biennials and perennials.
Do all plants have the same life cycle?
Flowering plants all go through the same stages of a life cycle
, but the length of time they take varies a lot between species. Some plants go though their complete cycle in a few weeks – others take many years. Annuals are plants that grow from a seed, then flower and make new seeds, then die, all in less than a year.
What is the life cycle of a plant?
The plant life cycle consists of four stages;
seed, sprout, small plant, and adult plant
. When the seed gets planted into the soil with water and sun, then it will start to grow into a small sprout.
What feature defines most plant life cycles?
What feature defines most plant life cycles? The life cycle of land plants has
two alternating phases, a diploid (2N) phase and a haploid (N) phase
. the alternation between the haploid gametophyte and the diploid sporophyte in a plant’s life cycle.
What do all plant life cycles have in common fertilization produces seeds?
The correct option is option c.)
Diploid and haploid phases alternate
. Explanation: In every plant life cycles the alternation of generation takes place, and the haploid and diploid phases alternates.
What do all plant life cycles have in common quizlet?
What do all plant life cycles have in common?
Diploid and haploid phases alternate
. haploid spores that undergo mitosis. Which term is the name of the diploid stage of the plant life cycle?
