Qhov Tseem Ceeb Qhov txawv - Microsporogenesis vs Megasporogenesis
Lub paj yog cov qauv tsim tawm ntawm angiosperms. Nws muaj cov txiv neej thiab poj niam cov khoom me me hauv nws. Txiv neej qhov chaw yug me nyuam yog lub npe hu ua stamens thiab poj niam kev yug me nyuam yog hu ua carpel. Angiosperms tsim ob hom spores (gametes) hu ua microspores thiab megaspores. Txiv neej spores hu ua microspores. Microspores yog tsim nyob rau hauv lub hnab paj ntoos ntawm cov anthers. Microspores yog haploid thiab tsim los ntawm diploid microspore niam hlwb (microsporocytes) los ntawm meiosis. Cov txheej txheem no hu ua microsporogenesis. Poj niam spores hu ua megaspores. Megaspores yog tsim nyob rau hauv megasporophylls. Megasporangium muaj megaspore niam hlwb (megasporocytes). Megaspore niam hlwb raug meiosis thiab tsim megaspores uas tom qab dhau los ua poj niam gametes. Kev tsim ntawm haploid megaspores los ntawm diploid megaspore niam cell hu ua megasporogenesis. Qhov sib txawv tseem ceeb ntawm microsporogenesis thiab megasporogenesis yog tias microsporogenesis yog txheej txheem ntawm microspore tsim thaum megasporogenesis yog txheej txheem ntawm megaspore tsim.
YMicrosporogenesis yog dab tsi?
Stamens yog txiv neej cov kab mob ntawm cov paj. Stamen muaj ob yam: anther thiab filament. Lub anther muaj microsporangia. Txhua microsporangium muaj microspore niam hlwb lossis microsporocytes. Cov hlwb no yog cov hlwb diploid thiab faib ua cov hlwb haploid hu ua microspores los ntawm meiosis. Microsporocytes tau txais ob qhov kev faib tawm nuclear ntawm meiosis ua raws li cytokinesis los tsim cov tetrad ntawm plaub haploid microspores. Cov txheej txheem no yog hu ua microsporogenesis. Microspores tau txais ob qhov kev faib tawm mitotic thiab tsim cov paj paj ntoo lossis txiv neej gametes. Txhua microspore txhim kho mus rau hauv paj ntoos nplej.
Daim duab 01: Microsporogenesis
pollens lossis microspores yog cov qauv me me. Tom qab tsim, microspores los yog paj ntoos nplej qhuav thiab ua hmoov. Lub anther dhau los ua cov qauv qhuav thiab paj ntoos tau tawm ntawm anther mus rau ib puag ncig los ntawm dehiscence ntawm anther.
Megasporogenesis yog dab tsi?
Megaspores yog tsim los ntawm megaspore niam hlwb (megasporocytes). Megasporangium los yog ovule muaj megaspore niam hlwb. Megaspore niam hlwb yog cov hlwb diploid (2n hlwb). Cov niam hlwb no faib los ntawm meiosis los tsim cov hlwb haploid (n cells). Ib niam cell faib los ntawm meiosis thiab tsim plaub haploid megaspores. Cov txheej txheem no hu ua megasporogenesis. Megasporogenesis tshwm sim hauv cov qauv hu ua nucellus (qhov nruab nrab ntawm lub ovule). Hauv cov nroj tsuag feem ntau, tsuas yog ib qho megaspore tsim rau hauv megagametophyte lossis lub hnab embryo. Lwm yam peb megaspores disintegrate. Qhov tshwj xeeb megaspore faib ua yim lub nuclei los ntawm ob qhov sib law liag mitotic thiab tsim cov megagametophyte.
Daim duab 02: Megasporogenesis
Dab tsi yog qhov zoo sib xws ntawm Microsporogenesis thiab Megasporogenesis?
- Microsporogenesis thiab megasporogenesis yog cov txheej txheem ntawm haploid cell tsim.
- Nyob rau hauv ob txheej txheem, diploid hlwb faib los ntawm meiosis.
- Ob txheej txheem tsim cov spores uas muab gametophytes.
- Ob txheej txheej tshwm sim hauv paj.
Qhov txawv ntawm Microsporogenesis thiab Megasporogenesis yog dab tsi?
Microsporogenesis vs Megasporogenesis |
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| Microsporogenesis yog tsim ntawm haploid microspores los ntawm diploid microspore niam cell los ntawm meiosis. | Megasporogenesis yog tsim ntawm haploid megaspores los ntawm diploid megaspore niam cell los ntawm meiosis. |
| Kev Npaj ntawm Spores hauv Tetrad | |
| Kev npaj ntawm microspores hauv tetrad yog tetrahedral hauv microsporogenesis. | Kev npaj ntawm megaspores hauv tetrad yog linear hauv megasporogenesis. |
| functional Spores | |
| Txhua plaub microspores tsim los ntawm microsporogenesis yog qhov ua haujlwm tau zoo. | Tsuas yog ib lub megaspore ntawm plaub megaspores uas tsim los ntawm megasporogenesis yog qhov ua haujlwm. |
| Microsporogenesis tshwm sim hauv cov hnab paj ntoos. | Megasporogenesis tshwm sim hauv ovule. |
| Production of Gametophytes | |
| Microspores tsim pollens. | Megaspores tsim cov hnab embryo |
Summary – Microsporogenesis vs Megasporogenesis
Microsporogenesis thiab megasporogenesis yog ob txheej txheem uas tshwm sim hauv cov noob nroj tsuag. Microspores thiab megaspores yog txiv neej thiab poj niam spores, feem. Microsporangia nyob rau hauv lub anthers ntawm stamens thiab muaj microspore niam hlwb uas yog 2n hlwb. Microspore niam cov hlwb raug meiosis thiab ua rau microspores uas yog n cells. Cov txheej txheem no hu ua microsporogenesis. Microspores undergo mitosis thiab tsim pollen nplej uas yog txiv neej gametes. Megasporangia hu ua ovules. Ovules muaj megaspore niam hlwb. Megaspore niam hlwb faib los ntawm meiosis thiab ua rau megaspores uas yog n hlwb. Kev tsim ntawm megaspores los ntawm megaspore niam hlwb hu ua megasporogenesis. Megaspores raug mitosis thiab tsim cov hnab embryo. Qhov no yog qhov txawv ntawm microsporogenesis thiab megasporogenesis.
Download PDF Version of Microsporogenesis vs Megasporogenesis
Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li cov ntawv sau tseg. Thov download PDF version ntawm no Qhov txawv Ntawm Microsporogenesis thiab Megasporogenesis.
