What do u mean by protonema?

What is protonema Class 11?

Complete answer: A protonema is a thread-like chain of cells that forms the gametophyte’s earliest stage of growth in the life cycle of mosses. Moss spores germinate to form the protonema, an alga-like filamentous structure.

What do u mean by protonema?

Definition of protonema : the primary usually filamentous thalloid stage of the gametophyte in mosses and in some liverworts comparable to the prothallus in ferns.

What is protonema and its function?

The protonema, which grows directly from the germinating spore, is in most mosses an extensive, branched system of multicellular filaments that are rich in chlorophyll. This stage initiates the accumulation of hormones that influence the further growth of newly formed cells

What is protonema example?

(i) Protonema It is a creeping, green, branched and frequently filamentous stage. It is a haploid, independent, gametophytic stage in the life cycle of mosses. It is produced from the spores and gives rise to new plants. Examples Funaria, polytrichum and sphagnum

What is protonema explain?

A protonema (plural: protonemata) is a thread-like chain of cells that forms the earliest stage of development of the gametophyte (the haploid phase) in the life cycle of mosses. Moss spores germinate to form an alga-like filamentous structure called the protonema.

What is protonema Brainly?

Answer: Protonema It is the first stage in the life cycle of a moss, developing directly from the spore. Moss spores germinate to form an algae-like filamentous structure called the protonema. It represents the juvenile gametophyte.

What is Antheridium Class 11?

(ii) Antheridium It is the male sex organ present in bryophytes and pteridophytes and is surrounded by a jacket of sterile cells. It encloses the sperm mother cells, which give rise to the male gametes.

What is Archegonium in biology class 11?

Archegonium is the female sex organ that produces the female gamete or egg. It is present in the life cycles of mosses (bryophytes), pteridophytes, and gymnosperms. Life cycle of a moss. Gametophytic stage is the predominant stage of the moss lifecycle. The Gametophytic stage consists of two stages.

What is protonema in biology class 11?

Complete answer: A protonema is a thread-like chain of cells that forms the gametophyte’s earliest stage of growth in the life cycle of mosses. Moss spores germinate to form the protonema, an alga-like filamentous structure.

What is protonema Toppr?

The protonema is an elongated and thread-like structure. This structure develops from the germinated spore of mosses and some liverworts. This structure forms the earliest stage in the life cycle of the bryophytes . The protonema then grows and developes to form the leafy gametophytic structure. Example, Funaria.

What is mean by proton Amma?

a primary, usually filamentous structure produced by the germination of the spore in mosses and certain related plants, and from which the leafy plant which bears the sexual organs arises as a lateral or terminal shoot.

What is meant by Gametophore?

Definition of gametophore : a modified branch (as of a moss) bearing gametangia.

What is protonema give its function?

A protonema (plural: protonemata) is a thread-like chain of cells that forms the earliest stage of development of the gametophyte (the haploid phase) in the life cycle of mosses. It represents the juvenile gametophyte.

What do you understand by protonema?

Complete answer: A protonema is a thread-like chain of cells that forms the gametophyte’s earliest stage of growth in the life cycle of mosses. Moss spores germinate to form the protonema, an alga-like filamentous structure.

What is the function of bryophytes?

Definition of protonema : the primary usually filamentous thalloid stage of the gametophyte in mosses and in some liverworts comparable to the prothallus in ferns.

What is Antheridium example?

An antheridium is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). Many algae and some fungi, for example ascomycetes and water moulds, also have antheridia during their reproductive stages.

What is protonema Class 11 short answer?

Complete answer: A protonema is a thread-like chain of cells that forms the gametophyte’s earliest stage of growth in the life cycle of mosses.

What do we mean by protonema?

Definition of protonema : the primary usually filamentous thalloid stage of the gametophyte in mosses and in some liverworts comparable to the prothallus in ferns.

What is a protonema in biology?

The protonema, which grows directly from the germinating spore, is in most mosses an extensive, branched system of multicellular filaments that are rich in chlorophyll. This stage initiates the accumulation of hormones that influence the further growth of newly formed cells.

What is a protonema Class 11?

Complete answer: A protonema is a thread-like chain of cells that forms the gametophyte’s earliest stage of growth in the life cycle of mosses. Moss spores germinate to form the protonema, an alga-like filamentous structure.

What is Antheridium explain with example?

An antheridium is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). Many algae and some fungi, for example ascomycetes and water moulds, also have antheridia during their reproductive stages.

What is the main function of protonema?

(ii) Antheridium It is the male sex organ present in bryophytes and pteridophytes and is surrounded by a jacket of sterile cells. It encloses the sperm mother cells, which give rise to the male gametes.

What is meant by protonema?

Definition of protonema : the primary usually filamentous thalloid stage of the gametophyte in mosses and in some liverworts comparable to the prothallus in ferns.

What is protonema stage class 11?

The protonema, which grows directly from the germinating spore, is in most mosses an extensive, branched system of multicellular filaments that are rich in chlorophyll. This stage initiates the accumulation of hormones that influence the further growth of newly formed cells

What is protonema where it is seen?

Hint: Protonema is a creeping, green, branched, and often filamentous stage of the growth process. It is a haploid, autonomous, gametophytic stage of the moss life cycle. Complete answer: A protonema is a thread-like chain of cells that forms the gametophyte’s earliest stage of growth in the life cycle of mosses.

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