![Nyob hauv gymnosperms pollination tshwm sim los ntawm? Nyob hauv gymnosperms pollination tshwm sim los ntawm?](https://i.tvmoviesgames.com/preview/questions/17861479-in-gymnosperms-pollination-takes-place-by-j.webp)
2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Nyob hauv gymnosperms, pollination koom nrog paj noob hlis hloov ntawm txiv neej lub khob rau poj niam lub khob . Thaum hloov mus, cov paj ntoos germinates los tsim cov paj paj paj paj paj paj paj paj paj ntoos yog tsim los ntawm txiv neej gametophytes ntawm cov noob nroj tsuag. Pollen hlab ua raws li cov conduits los thauj cov txiv neej gamete hlwb los ntawm paj ntoos nplej-los ntawm stigma (hauv paj ntoo) mus rau ovules ntawm lub hauv paus ntawm cov pistil los yog ncaj qha los ntawm ovule ntaub so ntswg nyob rau hauv ib co gymnosperms. https://en.wikipedia.org › wiki › Pollen_tube
Pollen tube - Wikipedia
thiab cov phev rau fertilizing lub qe.
Dab tsi yog gymnosperms pollinated los ntawm?
Nrog rau niaj hnub gymnosperms, conifers thiab Ginkgo tsuas yog cua pollinated whereas ntau gnetaleans thiab cycads yog kab pollinated. Rau cycads, thrips yog tshwj xeeb pollinators.
Puas yog gymnosperms pollinated los ntawm kab?
Tsis zoo li niaj hnub cua-pollinated conifers thiab Ginkgo, cycads yog qhov txawv ntawm qhov lawv yog ib pab pawg qub gymnosperms pollinated los ntawm kab, xws li beetlesthiab tsis tshua muaj thrips. … Cov hom kuj yog cov kws tshaj lij pollinators ntawm tib lub clade ntawm niaj hnub cycads.
Yuav ua li cas feem ntau uas gymnosperms pollinated?
Kawg, cuaplays lub luag haujlwm tseem ceeb hauv pollination hauv gymnosperms vim paj ntoos yog cua tshuab los ntawm cov poj niam cones. Txawm tias muaj ntau yam angiospermskuj yog cua-pollinated, tsiaj pollination ntau dua.
Puas yog gymnosperms tuaj yeem pollinated los ntawm cua?
Gymnosperms sawv cev rau feem ntau ntawm cov cua-pollinated hom, thiab txog 98% ntawm hom gymnosperm yog cua-pollinated (Faegri thiab van der Pijl 1979). Tsis zoo li angiosperms, uas cua pollination hloov zuj zus los ntawm kab pollination (Culley li al. 2002), cua pollination yog cov poj koob yawm txwv lub xeev hauv gymnosperms (Owens li al.
Pom zoo:
Dab tsi ntawm cov hauv qab no tuaj yeem tshwm sim los ntawm evaporator khov?
![Dab tsi ntawm cov hauv qab no tuaj yeem tshwm sim los ntawm evaporator khov? Dab tsi ntawm cov hauv qab no tuaj yeem tshwm sim los ntawm evaporator khov?](https://i.tvmoviesgames.com/preview/questions/17840649-which-of-the-following-can-result-from-evaporator-freeze-up-j.webp)
Dab tsi ntawm cov hauv qab no tuaj yeem tshwm sim los ntawm evaporator khov? Huab cua tsis rub hla lub fins, Cov tub yees yuav tsis zoo evaporate. & Lub tshuab cua txias ua kom txias me ntsis lossis tsis muaj cua txias. Qhov twg ntawm cov xwm txheej hauv qab no tuaj yeem ua rau muaj qhov khov ntawm cov evaporator?
Dab tsi ntawm qhov tshwm sim hauv qab no tau sim ua pov thawj los ntawm?
![Dab tsi ntawm qhov tshwm sim hauv qab no tau sim ua pov thawj los ntawm? Dab tsi ntawm qhov tshwm sim hauv qab no tau sim ua pov thawj los ntawm?](https://i.tvmoviesgames.com/preview/questions/17840940-which-of-the-following-phenomenon-was-experimentally-proved-by-j.webp)
The Meselson thiab Stahl kev sim yog qhov kev sim ua pov thawj tias DNA rov ua dua yog ib nrab kev saib xyuas ib nrab kev saib xyuas Semiconservative replication piav qhia lub tshuab ntawm DNA rov ua dua hauv txhua lub hlwb paub. … Cov txheej txheem no hu ua semi-conservative replication vim hais tias ob daim ntawv luam ntawm tus thawj DNA molecule raug tsim.
Dab tsi ntawm cov hauv qab no yog qhov tshwm sim ntawm kev sib ntaus sib tua ntawm lub pas dej brandywine?
![Dab tsi ntawm cov hauv qab no yog qhov tshwm sim ntawm kev sib ntaus sib tua ntawm lub pas dej brandywine? Dab tsi ntawm cov hauv qab no yog qhov tshwm sim ntawm kev sib ntaus sib tua ntawm lub pas dej brandywine?](https://i.tvmoviesgames.com/preview/questions/17892661-which-of-the-following-was-a-result-of-the-battle-at-brandywine-creek-j.webp)
Cov txiaj ntsig ntawm Kev Sib Tw ntawm Brandywine Creek yog dab tsi? Washington tsuas yog sim ncua kev ntes Philadelphia kom nws ua tiav li no. Cov tub rog Asmeskas tsis tau poob siab ntau thiab lawv tau khiav tawm ntawm British. Washington tseem tuaj yeem kawm los ntawm nws qhov yuam kev ntawm kev tso nws txoj cai sab xis qhib.
Nyob rau hauv lub cev ntawm tus txiv neej aqueduct ntawm sylvius tshwm sim nyob rau hauv?
![Nyob rau hauv lub cev ntawm tus txiv neej aqueduct ntawm sylvius tshwm sim nyob rau hauv? Nyob rau hauv lub cev ntawm tus txiv neej aqueduct ntawm sylvius tshwm sim nyob rau hauv?](https://i.tvmoviesgames.com/preview/questions/17933768-in-the-anatomy-of-man-aqueduct-of-sylvius-occurs-in-j.webp)
Lub ventricles muaj plaub qhov khoob, cov kua dej puv hauv lub hlwb. … Nws txuas nrog lub paj hlwb aqueduct lossis aqueduct ntawm Sylvius hauv qhov nruab nrab ntawm lub hlwbrau plaub lub ventricle hauv pons thiab medulla. Lub aqueduct ntawm Sylvius nyob qhov twg?
Yuav ua li cas txiav txim siab seb qhov kev tshwm sim yog tshwm sim los yog tsis ua raws li txoj cai?
![Yuav ua li cas txiav txim siab seb qhov kev tshwm sim yog tshwm sim los yog tsis ua raws li txoj cai? Yuav ua li cas txiav txim siab seb qhov kev tshwm sim yog tshwm sim los yog tsis ua raws li txoj cai?](https://i.tvmoviesgames.com/preview/questions/17934726-how-to-determine-if-a-reaction-is-spontaneous-or-nonspontaneous-j.webp)
Kev sib xyaw ua lej ntawm kev hloov pauv enthalpy thiab hloov pauv hloov pauv tso cai rau kev hloov pauv ntawm lub zog dawb los suav. A tawm tsam nrog tus nqi tsis zoo rau ΔG tso tawm lub zog dawb thiab yog li nws tus kheej. Cov tshuaj tiv thaiv nrog qhov zoo ΔG yog tsis ua raws li kev xav thiab yuav tsis nyiam cov khoom.