2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Teb: Tapetum: Nws develops thaum lub sij hawm microsporogensis nyob rau hauv lub anther (microsporangium.) Nws muaj nuj nqi yog muab cov khoom noj rau cov qoob loo loj hlob. Synergids: Lawv tsim thaum lub sij hawm megasporogenesis hauv ovule (megasporangium.)
Qhov chaw thiab txoj haujlwm ntawm tapetum yog dab tsi?
Tapetum yog txheej txheej ntawm tes sab hauv hauv lub anther, uas nyob ib puag ncig cov paj paj hlwb (PMCs) thiab / lossis microspores muab khoom noj khoom haus thiab enzymes xav tau rau microsporogenesis thiab paj ntoos maturation.
tapetum function yog dab tsi?
Tapetum yog txheej sab hauv ntawm microsporangium. Nws muab khoom noj rau cov qoob loo loj hlob. Thaum lub sij hawm microsporogenesis, lub hlwb ntawm tapetum tsim ntau yam enzymes, cov tshuaj hormones, amino acids, thiab lwm yam khoom noj uas yuav tsum tau rau kev loj hlob ntawm paj paj noob qoob loo.
Pob tapetum pab tsim lub embryo sac?
Tapetum yog tsim thaum lub sijhawm tsim ntawm microsporangium. Nws yog tsim los ua ib txheej cellular sab nraum cov ntaub so ntswg sporogenous. Nws pab muab khoom noj khoom haus rau microspore. Synergids yog tsim nyob rau hauv lub embryo sac thaum lub sij hawm tus txheej txheem ntawm megasporogenesis.
Dab tsi yog lub luag haujlwm ntawm tapetum hauv anther?
Cov tapetum yog tshwj xeeb txheej ntawm cov khoom noj khoom hauspom nyob rau hauv lub anther, ntawm paj paj, qhov chaw nws nyob nruab nrab ntawm cov ntaub so ntswg sporangenous thiab phab ntsa anther. TapetumNws yog ib qho tseem ceeb rau kev noj haus thiab kev loj hlob ntawm paj paj noob qoob loo, nrog rau lub hauv paus ntawm precursors rau paj paj.
Pom zoo:
Qhov twg thiab thaum twg tau pib qhov luddite?
Luddite, cov tswv cuab ntawm pawg koom ua ke ntawm 19th-xyoo pua cov neeg ua haujlwm Askiv uas tau tawm tsam rau kev puas tsuaj ntawm cov tshuab textile uas tau hloov chaw. Lub zog pib nyob ib puag ncig ntawm Nottingham mus rau qhov kawg ntawm 1811 thiab xyoo tom ntej kis mus rau Yorkshire, Lancashire, Derbyshire, thiab Leicestershire.
Thaum twg qhov kub ntawm qhov siab tshaj plaws thiab qis tshaj?
Qhov kub tshaj plaws uas tau sau tseg hauv ntiaj teb yog 136 Fahrenheit (58 Celsius) hauv Libyan suab puam. Qhov ntsuas kub tshaj plaws uas tau ntsuas yog -126 Fahrenheit (-88 Celsius) ntawm Vostok Chaw Nres Tsheb hauv Antarctica. Thaum twg qhov kub ntawm qhov qis tshaj?
Qhov twg thiab qhov twg yog qhov hav silicon?
Silicon Valley yog ntiaj teb qhov chaw ntawm kev tsim kho thev naus laus zis nyob hauv South San Francisco Bay Area ntawm California. Silicon Valley yog lub tsev rau ntau lub tuam txhab thev naus laus zis, software, thiab internet. Qee lub tuam txhab loj hauv cheeb tsam suav nrog Apple, Alphabet's Google, Chevon, Facebook, thiab Visa.
Qhov txawv ntawm qhov twg thiab qhov twg?
Raws li adverbs qhov txawv ntawm nowhere thiab qhov twg yog hais tias tsis muaj qhov twg thaum nyob qhov twg nyob rau hauv los yog nyob rau hauv ib qhov chaw los yog ib qho chaw tsis paub. Kuv siv qhov twg? Koj siv tsis tau qhov twg thaum ua cov lus tsis zoo los hais tias qhov chaw tsim nyog ntawm hom tsis muaj.
Vim li cas qhov tseem ceeb ntawm qhov muaj zog thiab qhov tsis muaj zog yog qhov tseem ceeb?
Nws yog ib qho tseem ceeb rau qhov tseem ceeb ntawm qhov ua tau zoo thiab qhov tsis muaj zog vim qhov no pab lub tuam txhab txiav txim siab txog thaj chaw uas lawv yuav tsum tau txhim kho ntxiv rau thaj chaw uas lawv ua tau zoo hauv. Vim li cas lub zog thiab qhov tsis muaj zog tseem ceeb?
