Tus qauv ntawm daim ntawv, tus txheej thiab puab

Nplooj - lateral vegetative yub txoj cai. Nws plays ib qho tseem ceeb luag hauj lwm nyob rau hauv lub neej ntawm lub tag nrho tsob nroj, nplooj qauv txheej txheem thiaj li hais tias nws yog muaj peev xwm kom pab tau rau cov ib puag ncig tej yam kev mob rau lub ce ntawm nws functions - photosynthesis, evaporation thiab nkev pauv, Guttation. Cov ntawv yuav tau hloov thiab yuav ib rab koob (li conifers) los yog pos (cacti thiab barberry, thiab lwm yam). Tej transformation ntawm lub sab yub tub ceev xwm pab cov nroj tsuag ciaj sia nyob rau hauv ntau yam climatic ib ncig chaw.

Cov sab nraud qauv ntawm daim ntawv nyob rau hauv cov nroj tsuag hom. Yog li ntawd, paub qhov txawv tej yam yooj yim thiab complex, stalked, sessile nplooj thiab qhwv nyob ib ncig ntawm. Yuav luag tag nrho cov sab yub tub ceev xwm tau txhab feem - nplooj hniav, uas tej zaum yuav khoom, ib tug txiav, ib tug hniav los yog cais. Lub petiole, uas assimilating lub cev lub ntsiab yog txuas mus rau tus kav, thiab tej zaum yuav tsis mus kawm zoo rau nws, ces hais tias daim ntawv teev "sedentary" los yog beschereshkovy. Yog hais tias lub lamina yog kiag li encircles zoo li ib tug soj caum, nws entwine sab yub txoj cai. Nyob rau hauv angiosperms nrog nplooj petioles thiab muaj stipules uas tiv thaiv cov tub ntxhais nplooj thiab axillary buds.

Lub morphological qauv ntawm daim ntawv kuj qhia tau hais tias lub xub ntiag ntawm tej yam yooj yim thiab complex nrhiav. Cias xa mus rau raws li lub cev lub ntsiab ntawm assimilating cov nroj tsuag, yog hais tias nws muaj ib tug soj caum thiab ib nplooj hniav, uas poob nkaus (maple, lilac, willow). Tiabsis cov nplooj muaj ib tug petiole 1 thiab ob peb nplooj tuaj hais tias yuav poob zuj zus (Walnut, chestnut, tshauv).

Lub sab hauv qauv ntawm daim ntawv yog zoo tib yam nyob rau hauv tag nrho cov nroj tsuag. Nplooj hniav sab saum toj thiab hauv qab them nrog ib tug txheej ntawm lub epidermis, uas tas ntawm daim tawv nqaij. Ib txhia ntawm muaj nyob rau hauv lub qaum daim tawv nqaij ntawm cov plaub mos mos yuav ua tau, zaj duab xis-cuticle los yog waxy lo. Cov no yog cov tag nrho cov kev ruaj ntseg pab kiag li lawm uas tiv thaiv overheating, kub nyhiab, ntev li dej evaporation. Lub cover ntaub nyob rau hauv feem ntau cov nroj tsuag, nrog rau cov hauv qab sab ntawm daim ntawv tau slotted keeb - stomata, uas muaj ob tug khwb hlwb. Tom qab stomatal apparatus kuaj gases thiab dej vapor, raws li nyob rau hauv lub sab khiav ntawm lub cev nws tus kheej thiab outwardly.

Lub cellular qauv ntawm daim ntawv qhia hauv lub xub ntiag ntawm cov ntaub - lub mesophyll, uas yog muab faib ua spongy thiab palisadnuyu (columnar) parenchyma. Lub structural units ntawm columnar cov ntaub so ntswg muaj ib tug lossis loj tus naj npawb ntawm chloroplasts, uas muaj peev xwm ua tau dhau mus rau lub hnub ci. Lub hlwb yog heev ze rau txhua lwm yam, nws yog nyob rau hauv lawv cov photosynthesis. Spongy cov ntaub so ntswg yog tsim los ntawm elementary hais ntawm ib tug nyob, uas muaj ib qho lus zoo, ib tug loj npaum li cas ntawm intercellular tshuaj thiab heev dim de stacked lawv tus kheej. Nws yuav siv sij hawm yog ib feem, tab sis tsis raws li active li cov palisade parenchyma, assimilation, raws li zoo raws li los ntawm nws cov huab cua qhov chaw nkev pauv tshwm sim. Tsis tas li ntawd nyob rau hauv daim ntawv yog leeg uas pab raws li receptacles, koom tes nyob rau hauv metabolism. Nws yog rau lawv cov dej uas muaj mineral tshuaj yog txhab khoom mus rau sab khiav ntawm lub cev lub hlwb, thiab cov outputs ntawm daim ntawv nws tus kheej organic compound tsim nyob rau hauv lub txheej txheem ntawm photosynthesis. Thiab loj leeg yog surrounded los ntawm fiber bundles tsim los ntawm cov neeg kho tshuab cov ntaub so ntswg thiab muab cov nplooj ntawm lub dag lub zog.

Yog li, cov qauv ntawm cov ntawv no heev thiab yog tshwm sim los ntawm lub zog ua los ntawm lub cev - assimilation, nkev pauv, Guttation thiab evaporation. Tsis tas li ntawd, dua li lub ntsiab, daim ntawv yuav tau ua ntxiv zog - kev tiv thaiv (spines), lub Tshuag ntawm cov ntaub ntawv (scales ntawm qhov muag) thiab vegetative hais tawm.