Qhov txawv ntawm Microspore thiab Pollen Grain

Cov txheej txheem:

Qhov txawv ntawm Microspore thiab Pollen Grain
Qhov txawv ntawm Microspore thiab Pollen Grain

Video: Qhov txawv ntawm Microspore thiab Pollen Grain

Video: Qhov txawv ntawm Microspore thiab Pollen Grain
Video: Qhov Txawv Ntawm Lus Hmoob Thiab Lus Mab Mawb 2024, Lub Xya hli ntuj
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Qhov sib txawv tseem ceeb ntawm microspore thiab paj ntoos nplej yog qhov microspore yog cov kab me me uas loj hlob mus rau txiv neej gametophyte hauv cov nroj tsuag thaum paj paj yog cov nplej me me uas muaj cov txiv neej gametophyte.

Nroj hlob zuj zus tshwm sim ob qho tib si sib deev thiab asexually, qhia txog kev hloov ntawm tiam. Muaj ob tiam neeg hu ua sporophytic tiam thiab gametophytic tiam. Microspore thiab pollen grain yog ob lub qauv uas tsim thaum lub sijhawm ob tiam no. Microspore yog ib tug qauv ntawm sporophytic tiam, whereas paj noob hlis yog ib tug qauv ntawm gametophytic tiam. Tsis tas li ntawd, lub microscope tsis yog gametophyte thaum paj paj noob hlis yog gametophyte.

YMicrospore yog dab tsi?

Muaj ob hom spores tsim nyob rau hauv heterosporous av nroj tsuag. Lawv yog megaspores thiab microspores. Lub megaspore loj hlob mus rau hauv cov poj niam gametophyte, thaum lub microspore loj hlob mus rau hauv txiv neej gametophyte. Yog li, microspores, txuas sporophytic tiam thiab gametophytic tiam thaum lub sij hawm hloov ntawm tiam. Lub gametophyte tsim los ntawm microspore ces tsim cov txiv neej gametes. Cov txiv neej gametes koom nrog kev sib deev ntawm cov nroj tsuag. Thaum kawg, lub microspore tsim rau hauv paj paj noob, uas yog tus txiv neej gametophyte tiag tiag.

Qhov txawv tseem ceeb - Microspore vs Pollen Grain
Qhov txawv tseem ceeb - Microspore vs Pollen Grain

Daim duab 01: Lub Neej Cycle ntawm Angiosperm

Haploid microspores muaj nyob hauv microsporangia hauv cov nplooj hloov pauv hu ua microsporophylls. Cov diploid microsporocytes tsim microspores los ntawm meiosis. Cov qauv ntawm microspore muaj peb txheej. Lawv yog txheej txheej txheej hu ua perispore, nruab nrab txheej hu ua exospore, thiab txheej sab hauv hu ua endospore.

Paj noob hlis yog dab tsi?

paj paj noob hlis yog txiv neej gametophyte tiag tiag. Yog li ntawd, nws tsim los ntawm microspore. Qhov tseeb, nws yog daim ntawv txo ntawm txiv neej gametophyte. Nws tsuas muaj nyob rau hauv cov noob nroj tsuag: angiosperms thiab gymnosperms. Kev loj hlob ntawm paj ntoos nplej los ntawm microspores tshwm sim los ntawm cov txheej txheem ntawm microgametogenesis. Meiosis yog lub hauv paus ntsiab lus tshwm sim hauv paj paj noob qoob loo.

Qhov sib txawv ntawm Microspore thiab Pollen Grain
Qhov sib txawv ntawm Microspore thiab Pollen Grain

Daim duab 02: paj ntoos nplej

Txhua paj paj noob hlis muaj plaub lub hlwb thiab ob lub hnab cua nyob sab nraud. Nyob rau hauv flowering nroj tsuag, paj paj noob muaj nyob rau hauv lub hnab nyob rau hauv lub anther. Lawv yog cov hlwb haploid. Lawv hloov mus rau poj niam gametophyte thaum pollination. Yog li, qhov no ua rau cov txheej txheem fertilization.

Dab tsi yog qhov zoo sib xws ntawm Microspore thiab Pollen Grain?

  • Microspore thiab paj ntoos nplej yog tsim los ntawm cov txheej txheem ntawm meiosis.
  • Ob leeg tsim tawm ntawm microsporocytes.
  • Ntxiv mus, ob qho tib si muaj nyob hauv cov nroj tsuag heterosporous.
  • Tsis tas li, ob qho tib si tshwm sim hauv kev tsim cov txiv neej (txiv neej gametangia) ntawm cov nroj tsuag thaum muaj kev sib deev.
  • Dhau li ntawd, lawv haploid nyob rau hauv xwm.
  • Ntxiv thiab, ob qho tib si yog cov qauv me me.

Qhov txawv ntawm Microspore thiab Pollen Grain yog dab tsi?

Qhov sib txawv tseem ceeb ntawm microspore thiab paj ntoos nplej yog raws li gametophyte. Qhov ntawd yog; lub microspore loj hlob mus rau hauv txiv neej gametophyte thaum paj paj noob muaj cov txiv neej gametophyte. Tsis tas li ntawd, microspores tsuas yog tsim los ntawm meiosis, thaum paj paj noob qoob loo loj hlob ntawm meiosis thiab tom qab ntawd raug mitosis. Hauv qhov no, qhov no kuj yog qhov sib txawv ntawm microspore thiab paj ntoos nplej.

Ntxiv mus, qhov sib txawv ntxiv ntawm microspore thiab paj paj noob qoob loo yog tias txawm tias ob lub hlwb muaj haploid hauv qhov xwm txheej, microspore yog unicellular, whereas paj ntoos nplej muaj ntau lub cellular.

Cov hauv qab no nthuav tawm cov ntaub ntawv ntxiv txog qhov sib txawv ntawm microspore thiab paj ntoos nplej.

Qhov sib txawv ntawm Microspore thiab Pollen Grain nyob rau hauv daim ntawv Tabular
Qhov sib txawv ntawm Microspore thiab Pollen Grain nyob rau hauv daim ntawv Tabular

Summary – Microspore vs Pollen Grain

Microspore thiab paj noob hlis yog cov qauv tseem ceeb hauv cov txheej txheem tsim tawm ntawm cov nroj tsuag vascular. Lub microspore tsim los ntawm microsporogenesis. Thaum cov xwm txheej zoo, cov microspores loj hlob mus rau txiv neej gametophytes hu ua paj noob hlis. Hauv qhov no, paj ntoos nplej yog txiv neej gametophyte uas muaj txiv neej gametes rau kev sib deev. Yog li ntawd, microspores ua raws li qhov txuas tseem ceeb ntawm kev sib deev thiab kev yug me nyuam asexual hauv cov nroj tsuag. Yog li, qhov no qhia txog qhov sib txawv ntawm microspore thiab paj ntoos nplej.

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