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This video will help you to learn What is the Lifecycle of a Moss?
What is the Lifecycle of a Moss?
Long long years ago, a special group of plants with a sense of adventure began making the journey from water to land.
What were these plants ??
Moss !!
There are thousands of known species of mosses.
But Question is….
What plant group does Moss belong to?
Bryophytes include the various mosses and liverworts that are found commonly growing in moist shaded areas in the hills.
Bryophytes are also called amphibians of the plant kingdom because these plants can live on soil but are dependent on water for sexual reproduction.
The plant body of bryophytes is more differentiated than that of algae.
It is thallus-like and prostrate or erect and attached to the substratum by unicellular or multicellular rhizoids.
They lack true roots, stem or leaves.
However, They may possess root-like, leaf-like or stem-like structures.
Mosses are small flowerless plants that typically grow in dense green clumps or mats, often in damp or shady locations.
Let’s learn more about Moss and it’s a life cycle
The predominant stage of the life cycle of a moss is the gametophyte which consists of two stages:-
(1) Protonema and
(2) Leafy stage
The first stage is the protonema stage, which develops directly from a spore.
It is a creeping, green, branched and frequently filamentous stage.
The second stage is the leafy stage, which develops from the secondary protonema as a lateral bud.
They consist of upright, slender axes bearing spirally arranged leaves.
They are attached to the soil through multicellular and branched rhizoids.
This stage bears sex organs.
The sex organs are multicellular.
The male sex organ is called the antheridium. They produce biflagellate antherozoids.
The female sex organ called archegonium is flask-shaped and produces a single egg.
The antherozoids are released into the water where they come in contact with archegonium.
An antherozoid fuses with the egg to produce the zygote.
Zygotes do not undergo a reduction division immediately.
They produce a multicellular body called a sporophyte.
The sporophyte is not free-living but is attached to the photosynthetic gametophyte and derives nourishment from it.
Some cells of the sporophyte undergo reduction division or meiosis to produce haploid spores.
These spores germinate to produce gametophyte.
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