How are the sperm of moss transported to the archegonia?
The sperm swims to the archegonia through a thin film of water, drawn by a chemical attractant produced by the female plant, then swims down the neck of the archegonia to the egg.
How does the sperm make its way to the archegonia?
Each archegonium holds one egg (in a swollen section called the venter) and the sperm enter through the channel in the narrower, tubular section (or neck). On the side of the venter opposite the neck is the foot which anchors the archegonium to the gametophyte.Sep 12, 2012
How do fern sperm get from the antheridia to the egg?
Fertilization is attained by the ejection of sperm from antheridia. The sperm swim through free water toward simple organic acids released at the opening of the archegonium, the neck of which spreads apart at the apex, permitting the neck cells to be extruded and the sperm to swim in and penetrate the egg.
How does fern sperm reach the egg?
Male and female reproductive structures develop on the lower surface of the same, or more often, on different gametophyte plants. At sexual maturity, the male structures release sperm that swim through the film of water of the moist habitat to fertilize the egg in the female structure.
How are sperm cells transferred from the antheridium to the archegonia in ferns?
The male structure, the antheridium, contains many flagellated sperm. The sperm are released from the antheridium and swim through a thin film of water to a nearby archegonium to fertilize the egg.
How ferns reproduce step by step?
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. Male and female cells are produced on these plants and after fertilisation occurs the adult fern begins to develop.
How does fertilization take place in ferns?
Fertilisation occurs when the fern's egg and sperm combine to form a zygote. Ferns require water to enable the movement of the sperm to reach the egg. A zygote is a combination of genetic material from both the egg and sperm and contains a complete set of DNA to form a new fern plant.Sep 24, 2010
How can the sperm cells find their way to the archegonia and on to the egg cell?
The female structure, called an archegonium, contains a single egg. The male structure, the antheridium, contains many flagellated sperm. The sperm are released from the antheridium and swim through a thin film of water to a nearby archegonium to fertilize the egg.
How do sperm find their way to the archegonium?
Each archegonium holds one egg (in a swollen section called the venter) and the sperm enter through the channel in the narrower, tubular section (or neck). On the side of the venter opposite the neck is the foot which anchors the archegonium to the gametophyte.Sep 12, 2012
How do sperm get out of the antheridium?
The release of sperms from an antheridium of Polytrichum juniperinum occurs in two phases: a rapid phase, completed within a few seconds, and a slow phase, usually completed in 1-5 min. The rapid phase depends on an elastic contraction of the jacket that forces all or most of the sperms out of the chamber.
What will form inside the archegonia when the sperm fertilizes the egg?
In moss fertilization, when the egg (archegonia) and sperm (antheridia) unite, the result is a cell called the zygote.