Cov nplooj yog qhov saum toj-hauv av ntawm cov nroj tsuag thiab muab ntau txoj haujlwm tseem ceeb. Ib qho ntawm lawv yog kev siv cov dej ntws nce thiab nqis qis nrog cov as-ham yaj hauv nws. Qhov no feem ntau tshwm sim nrog kev pab ntawm vascular fibrous bundles - leeg. Lawv yooj yim pom ntawm nplooj nplooj txawm tias qhov muag liab qab. Nplooj venation, nws hom thiab cov yam ntxwv ntawm kev ua haujlwm yuav tau tham hauv peb tsab xov xwm.
Yuav ua li cas yog nplooj ntoo
Muaj tseeb tiag, xav txog cov nplooj nplooj, koj pom cov qauv sib txawv ntawm nws qhov chaw. Qhov no yog cov leeg ntawm nplooj. Tab sis qhov no tsis yog ib tug yam ntxwv qauv. Nws yog ib feem ntawm cov ntaub so ntswg conductive ntawm cov nroj tsuag. Cov hlab ntsha, uas tseem hu ua vascular fibrous bundles, muaj cov hlab ntsha thiab cov hlab ntsha. Thawj qhov muab cov dej ntws nce siab. Nws essence yog nyob rau hauv lub zog ntawm ib tug kua nrog minerals yaj nyob rau hauv nws los ntawmcag rau nplooj. Cov txheej txheem no tseem ceeb heev, vim tias dej yog qhov tsim nyog rau kev siv cov txheej txheem ntawm photosynthesis.
Vination ntawm nplooj kuj muab cov txheej txheem thim rov qab. Nws essence yog nyob rau hauv lub zog ntawm cov organic tshuaj uas tau tsim nyob rau hauv nplooj thaum lub sij hawm photosynthesis mus rau lwm qhov chaw ntawm cov nroj tsuag. Qhov no yog ua los ntawm sieve raj ntawm cov ntaub so ntswg conductive. Raws li txoj cai, cov hlab ntsha nyob rau saum cov hlab sieve thiab ua ke ua lub hauv paus ntawm nplooj.
Nyob ntawm nplooj venation
Vascular fibrous bundles nyob rau hauv nplooj nyob rau hauv ntau txoj kev. Qhov xwm ntawm lawv qhov chaw yog venation ntawm nplooj. Qhov no feature yog systematic. Qhov no txhais tau hais tias los ntawm nws hom nws muaj peev xwm los txiav txim qhov kev faib tawm ntawm cov nroj tsuag. Piv txwv li, reticulate venation yog yam ntxwv ntawm nplooj ntawm cov nroj tsuag dicotyledonous. Cov nplooj ntawm cherries, pears, apples muaj xws li ib tug qauv. Thiab parallel thiab arc - rau monocots. Piv txwv ntawm cov nroj tsuag nrog hom venation no yog lily ntawm hav, leek, nplej, barley. Qhov xwm ntawm venation yog ib qho yooj yim los txiav txim qhov muag pom. Cia wb mus saib nws hom tseem ceeb.
Parallel venation of nplooj
Nws muaj kev sib raug zoo ntawm lamina hom thiab venation. Cia peb saib cov nplej nplej ua piv txwv. Qhov no linear-leaved nroj yog ib tug tsis muaj kab mob. Kev tshem tawm nws tuaj yeem nyuaj heev. Cov leeg ntawm cov nplooj zoo li no tiag tiag nyob yuav luag hauv ib kab. Hom venation no hu uathaum uas tig mus. Nws yog yam ntxwv ntawm tag nrho cov cereals, uas yog cov sawv cev ntawm monocots.
Arc venation
Yog cov nplooj nplooj dav dua, tab sis elongated, ces cov leeg tawm ntawm nws lub hauv paus. Tsis tas li ntawd, lawv diverge nyob rau hauv daim ntawv ntawm arcs, thiab txuas rau saum. Nws yog tsis yooj yim sua kom ib leeg tawm ntawm lub ntsiab hlab ntsha ntawm lawv, vim hais tias lawv yog tag nrho cov zoo tib yam thiab loj. Qhov no yog arc venation ntawm nplooj, uas yog ib txwm rau plantain, lily ntawm lub hav, tulip.
hom venation no feem ntau tshwm sim. Qhov tseeb no yooj yim piav qhia. Reticulate venation ntawm nplooj yog cov yam ntxwv ntawm ntsuab ib feem ntawm tag nrho cov dicotyledonous cov neeg sawv cev, thiab lawv tuav ib tug tseem ceeb txoj hauj lwm nyob rau hauv lub ntiaj teb no cog. Hais txog kev nplua nuj thiab ntau haiv neeg, lawv muaj ntau tshaj li lwm tus.
Txhua tus tau pom maple lossis txiv apple nplooj. Lub ntsiab hlab ntsha yog kom meej meej distinguished rau lawv. Tsis tshua pom vascular-fibrous bundles ntawm qhov kev txiav txim thib ob tawm ntawm nws hauv ob qho tib si. Nyob rau hauv kev sib raug zoo rau ib leeg, lawv nyob yuav luag sib luag. Los ntawm cov leeg ntawm qhov kev txiav txim thib ob, nyob rau hauv lem, tawm txawm me me. Ua ke lawv tsim ib lub network ntom ntawm cov ntsiab lus ntawm cov ntaub so ntswg ntawm nplooj nplooj. Txhawm rau muab txhua yam khoom tsim nyog rau lub neej zoo, qhov no yog hom venation zoo tshaj plaws. Cov nroj tsuag ntawm tsev neeg Rosaceae, Cabbage, Legumes, Solanaceae, Asteraceae yog ib qho piv txwv zoo.
Yog li, los xaus: nplooj venation yogqhov xwm txheej ntawm qhov chaw ntawm vascular fibrous bundles ntawm lub phaj. Lawv yog cov ntsiab lus ntawm cov ntaub so ntswg conductive thiab xyuas kom lub zog ntawm cov as-ham thoob plaws hauv cov nroj tsuag. Muaj peb yam tseem ceeb ntawm venation: reticulate, parallel thiab arcuate.
