Qhov txawv ntawm paj ntoos thiab Spore

Qhov txawv ntawm paj ntoos thiab Spore
Qhov txawv ntawm paj ntoos thiab Spore

Video: Qhov txawv ntawm paj ntoos thiab Spore

Video: Qhov txawv ntawm paj ntoos thiab Spore
Video: Playful Kiss - Playful Kiss: Full Episode 1 (Official & HD with subtitles) 2024, Kaum ib hlis
Anonim

Pollen vs Spore

Diploid spore niam hlwb ua rau spores. Spores yog cov qauv haploid. Lawv yog cov tseem ceeb rau kev yug me nyuam nrog rau kev ciaj sia nyob rau hauv cov xwm txheej tsis zoo. Spores pom raws li ib feem ntawm lub neej voj voog ntawm ntau yam kab mob xws li cov nroj tsuag, fungi, kab mob, algae thiab lwm yam. Nyob rau hauv cov nroj tsuag, nyob ntawm seb ntau hom spores, ib tsob nroj yuav homosporous los yog heterosporous. Yog hais tias cov nroj tsuag tsuas muaj ib hom spores, nws yog hu ua homospory. Yog hais tias cov nroj tsuag muaj ob hom spores uas yog txiv neej thiab poj niam spores, nws yog hu ua heterospory.

Spore

Yuav luag tag nrho cov noob kabmob cog yog heterosporous. Lawv muaj cov spores loj, uas hu ua megaspores hauv megasporangium, thiab cov spores me me, uas yog hu ua microspores hauv microsporangium. Thaum cov spores loj tuaj lawv dhau los ua gametophytes. Cov megaspores ua poj niam gametophytes thiab microspores ua txiv neej gametophytes. Tsis zoo li hauv cov nroj tsuag thaum ub, nyob rau hauv cov noob bearing nroj tsuag, cov gametophytes yeej tsis tso tawm ntawm cov spores. Qhov no tuaj yeem suav tau tias yog kev hloov pauv hloov pauv. Vim qhov xwm txheej no, gametophytes zoo tiv thaiv los ntawm desiccation. Tab sis cov txiv neej phev uas tsim los ntawm txiv neej gametophyte yuav tsum mus txog lub qe poj niam. Qhov no yog ua los ntawm dispersal ntawm spores. Spores tuaj yeem tawg los ntawm cua, dej, lossis kab.

Paj noob hlis

Txiv neej spores hu ua microspores. Microspores tseem hu ua pollen nplej. Nyob rau hauv flowering nroj tsuag, microspores muaj nyob rau hauv lub paj ntoos hnab los yog microsporangium. Microspores yog me me heev, cov txheej txheem feeb. Lawv yuav luag zoo li hmoov av. Txhua microspore muaj ib lub cell thiab ob lub tsho loj. Lub tsho loj tshaj plaws yog lub extine, thiab sab hauv yog lub intine. Extine yog ib txheej tawv, cutinized txheej. Feem ntau nws muaj spinous outgrowths. Qee lub sij hawm nws tuaj yeem ua tau zoo, thiab. Lub intine yog du, thiab nws yog heev nyias. Nws feem ntau yog ua los ntawm cellulose. Lub extine muaj ib lossis ntau qhov chaw nyias uas hu ua cov kab mob pores los ntawm qhov intine loj hlob tawm los ua lub paj paj noob hlis. Lub raj paj ntoos elongates trough cov ntaub so ntswg gynoecium nqa ob tug txiv neej gametes hauv nws. Pollen tube loj hlob thiab nkag mus rau hauv ovule los ntawm micropyle. Tom qab ntawd lub apex ntawm lub paj paj ntoos degrades thiab ob tug txiv neej nuclei raug tso rau hauv lub ovule. Ob chav fertilization tshwm sim los ntawm fusion ntawm ib tug txiv neej nucleus nrog lub qe cell nucleus, muab nce mus rau lub diploid zygote, thiab fusion ntawm lwm tus txiv neej nucleus nrog lub diploid secondary nucleus muab nce mus rau triploid thawj endosperm nucleus.

Dab tsi yog qhov txawv ntawm Spores thiab Pollens?

• Spores yog cov kab mob haploid xeeb tub thiab uas tuaj yeem yog poj niam loj spores, uas yog hu ua megaspores, lossis cov txiv neej me me, uas hu ua microspores (pollens). Hauv lwm lo lus, tag nrho cov paj ntoos yog spores, tab sis tsis yog tag nrho cov spores yog paj ntoos.

• pollens yog tsim los ntawm microspore niam hlwb, tab sis poj niam spores yog tsim los ntawm megaspore niam hlwb.

• paj ntoos nplej muaj ob lub tsho sab nrauv extine thiab intine thiab poj niam spores tsis muaj extine lossis intine.

• pollens yog dispersed los ntawm ntau yam mechanisms, tab sis poj niam spores yog khaws cia nyob rau hauv lub zes qe menyuam.

• pollens muaj nyob rau hauv lub hnab paj ntoos, thiab poj niam spores pom nyob rau hauv lub ovule.

Pom zoo: