Life Cycle of Moss Plant
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Questions and Answers

What is the life cycle of Bryophytes described as?

  • Alternation of mutation
  • Alternation of evolution
  • Alternation of generation (correct)
  • Alternation of adaptation

    • What is the structure produced by the germination of a haploid spore?

  • Sporophyte
  • Rhizoid
  • Gametophyte
  • Protonema (correct)

    • What is the function of antheridia in the life cycle of mosses?

  • To produce eggs
  • To produce biflagellate sperms (correct)
  • To produce rhizoids
  • To produce gametophyte stems

    • What is the result of the fertilization of an egg by a sperm in the life cycle of mosses?

    <p>Formation of sporophyte</p> Signup and view all the answers

    What is the structure that produces haploid spores in the life cycle of mosses?

    <p>Sporophyte</p> Signup and view all the answers

    What is the function of the seta in the life cycle of mosses?

    <p>To hold the capsule</p> Signup and view all the answers

    What is the function of archegonium in the life cycle of mosses?

    <p>Produces eggs called oosphere</p> Signup and view all the answers

    What is the type of sperm produced by antheridium in the life cycle of mosses?

    <p>Biflagellate sperm</p> Signup and view all the answers

    What is the function of the calyptra in the life cycle of mosses?

    <p>Protects the sporophyte</p> Signup and view all the answers

    What is the result of meiosis in the life cycle of mosses?

    <p>Production of haploid spores</p> Signup and view all the answers

    What is the function of rhizoids in the life cycle of mosses?

    <p>Anchors the plant</p> Signup and view all the answers

    What is the function of the foot in the life cycle of mosses?

    <p>Embedded in the gametophyte tissue</p> Signup and view all the answers

    What is the function of the seta in the life cycle of mosses?

    <p>Supports the capsule</p> Signup and view all the answers

    What is the result of fertilization of an egg by a sperm in the life cycle of mosses?

    <p>Produces a zygote</p> Signup and view all the answers

    Study Notes

    Life Cycle of Moss Plant

    • The life cycle of Bryophytes involves alternation of generation between asexual spore-producing and sexual gamete-producing generations.

    Stage 1: Spore Germination

    • A haploid spore germinates to produce a protonema (a branching filamentous or thalloid structure).
    • The protonema grows into a green gametophyte.

    Stage 2: Gametophyte Development

    • The gametophyte is structurally differentiated into rhizoids, stems, and leaves.
    • The tips of the gametophyte stems or branches develop sex organs:
      • Female organs: archegonia (singular: archegonium)
      • Male organs: antheridia (singular: antheridium)
    • Archegonia produce eggs called oosphere.
    • Antheridia produce biflagellate sperms called antherozoids.

    Stage 3: Fertilization

    • In the presence of water, antherozoids from antheridia swim to fertilize the egg in the archegonium.
    • Fertilization forms a zygote.

    Stage 4: Sporophyte Development

    • The zygote develops into a sporophyte.
    • The sporophyte body consists of:
      • A capsule with a cap called the calyptra
      • A long stalk called a seta
      • A foot embedded in the gametophyte tissue
    • Mature capsule undergoes meiosis to produce haploid spores.

    Stage 5: Spore Dispersal

    • The capsule bursts to release the spores.
    • Spores germinate to produce a branching protonema, starting the cycle again.

    Life Cycle of Moss Plant

    • The life cycle of Bryophytes is characterized as an alternation of generation between asexual spore-producing and sexual gamete-producing generations.

    Germination of Spore

    • A haploid spore germinates to produce a branching filamentous or thalloid structure called protonema.
    • The protonema grows into a green gametophyte, which is structurally differentiated into:
      • Rhizoids
      • Stems
      • Leaves

    Development of Sex Organs

    • The tips of the gametophyte stems or branches develop sex organs, including:
      • Female organs: archegonia (singular: archegonium)
      • Male organs: antheridia (singular: antheridium)

    Reproduction

    • Archegonium produces eggs called oosphere.
    • Antheridium produces biflagellate sperms called antherozoids.
    • In the presence of water, sperm from the antheridia swim to fertilize the egg in the archegonium, forming a zygote.

    Development of Sporophyte

    • The zygote develops into a sporophyte, comprising:
      • A capsule with a cap called the calyptra
      • A long stalk called a seta
      • A foot embedded in the gametophyte tissue
    • Mature capsule undergoes meiosis to produce haploid spores.

    Dispersal of Spores

    • The capsule bursts to release the spores, which germinate to produce a branching protonema, starting the life cycle anew.

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    Description

    Quiz about the life cycle of Bryophytes, including the alternation of generation and the development of protonema and gametophyte.

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