Example of alternation of generations: life cycle of a fern.
Haploid (1n) spores germinate and undergo mitosis to produce a multicellular gametophyte (1n)
. Specialized cells of the gametophyte undergo mitosis to produce sperm and egg cells (1n), which combine in fertilization to make a zygote (2n).
Does meiosis occur in ferns?
Meiosis in ferns occurs at the time of spore formation
. The plant body of ferns is sporophytic (2n), differentiated into leaves, stems and roots. Sporangia are borne in sori on the ventral surface of the leaves. Spores are found within the sporangium formed by reduction division.
Do ferns reproduce asexually?
Sporophyte ferns have two methods of asexual reproduction
. One is by vegetative cloning, branching off of the root-like underground stem, or rhizome, often forming large, genetically uniform colonies. The second form of asexual reproduction occurs by spores.
How does a fern reproduce?
Ferns do not flower but reproduce
sexually from spores
. There are two distinct stages of the fern life cycle. Mature plants produce spores on the underside of the leaves. When these germinate they grow into small heart-shaped plants known as prothalli.
Are fern spores produced by mitosis or meiosis?
Unlike some other non-flowering vascular plants, ferns produce one type of spore (homosporous) via
meiosis
in the sac-like sporangia. Within each sporangium, the diploid spores (spore mother cells or sporocytes) undergo meiosis.
How is fern life cycle different from Moss?
Also, both mosses and ferns show alternation of generation. But,
the dominant phase of the life cycle of mosses is the haploid gametophyte generation, while the dominant phase of the life cycle of ferns is the diploid sporophyte generation
. Therefore, this is another important difference between mosses and ferns.
At which location in the fern life cycle figure would meiosis take place?
On the underside of the fronds
are sporangia. Within the sporangia are spore producing cells called sporogenous cells. These cells undergo meiosis to form haploid spores. The spores on most ferns are the same size and perform the same function.
Where does meiosis occur in the life cycle of a moss?
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 life cycle of algae?
There are four types of life cycle in algae such as
Triphasic Life Cycle, Diplohaplontic Life Cycle, Diplontic Life Cycle, and Haplontic Life Cycle
.
Do ferns have sperm?
The sex organs of ferns are of two types.
The sperm-producing organ, the antheridium, consists of a jacket of sterile cells with sperm-producing cells inside
. Antheridia may be sunken (as in the families Ophioglossaceae and Marattiaceae) or protruding.
Where are spores formed in ferns?
In fern, spores are formed
in sporangium
. The plants of Pteridophytes are sporophytes. They reproduce asexually by forming spores in sporangia. In ferns an unbranched sporophyte produces sporangium, which may be quite complex morphologically.
How do ferns reproduce answer?
Ferns reproduce
by producing and releasing spores in the sporophyte generation
. Spores are formed from the sporangia of the fern, which are located…
Do ferns reproduce by spores?
Reproduction by Spores
Plants we see as ferns or horsetails are the sporophyte generation.
The sporophyte generally releases spores in the summer
. Spores must land on a suitable surface, such as a moist protected area to germinate and grow into gametophytes.
Do ferns have vascular tissue?
The ferns, gymnosperms, and flowering plants are all vascular plants. Because
they possess vascular tissues
, these plants have true stems, leaves, and roots.
How do ferns reproduce without seeds?
Some plants, like ferns and mosses,
grow from spores
. Other plants use asexual vegetative reproduction and grow new plants from rhizomes or tubers. We can also use techniques like grafting or take cuttings to make new plants.
Why is the life cycle of fern different from most plants?
The life cycle of ferns is different from other land plants as
both the gametophyte and the sporophyte phases are free living
. This interactive illustrates the alternation of generations in ferns.
What happens to the spores of ferns?
Fern spore germination
gives rise to the rhizoid and protonemal cell through asymmetric cell division, and then develops into a gametophyte
.
What type of spores are produced in fern plant?
Some lycophytes and ferns are heterosporous (two kinds of spores are produced). These plants produce
microspores and megaspores
, which give rise to gametophytes that are functionally male or female, respectively.
What do the moss life cycle and the fern life cycle have in common?
Both mosses and ferns have
gametophyte and sporophyte stages
in their life cycle.
How is the fern life cycle different from the moss life cycle quizlet?
How are the gametophyte states of a moss and a fern different? How are they same? The gametophyte phases of both plants are photosynthetic. Moss gametophytes are larger than the sporophytes, but
fern gametophytes are smaller than the sporophytes
.
Is the fern life cycle gametophyte or sporophyte dominant?
In the life cycle of a fern,
the sporophyte generation is dominant
. A mature sporophyte fern has the familiar leafy fronds. The undersides of the leaves are dotted with clusters of sporangia. Sporangia produce spores that develop into tiny, heart-shaped gametophytes.
Where does mitosis occur in the life cycle of a moss?
After fertilization, the archegonium on the gametophyte plant becomes modified into a protective sheath around the young sporophyte. The sporophyte begins to grow by mitosis (diploid cell division)
out of the top of the archegonium
.
Where does mitosis occur in bryophytes?
The zygote undergoes mitosis to produce a new diploid sporophyte, which emerges from
the archegonium
. Each archegonium produces a single egg cell by mitosis. Within each antheridium, mitosis produces many biflagellate (two flagella) sperm.
What occurs in the life cycle of a moss but not in the life cycle of a gymnosperm?
1 Answer. In moss,
sperm and egg cells are produced after haploid spores are separated from the sporophyte plant
– occurs in the life cycle of a moss but not in the life cycle of a gymnosperm.
Does mitosis occur in plants?
Yes, plants also undergo mitosis
and meiosis similar to animal cells. Mitosis is required for growth, asexual reproduction and regeneration. Daughter cells produced by mitosis are identical to the parent cell.
What occurs in the life cycle of a moss?
The life cycle of a moss, like all plants, is characterized by
an alternation of generations
. A diploid generation, called the sporophyte, follows a haploid generation, called the gametophyte, which is in turn followed by the next sporophyte generation.
Does meiosis occur in plants?
In flowering plants, meiosis occurs in megaspore mother cells (megasporocytes) within the ovules of ovaries, and in microspore mother cells (microsporocytes) within the anthers of stamens
.
