Yog li, lo lus teb raug yog, " Exarch xylem pom nyob hauv paus. "
exarch condition nyob qhov twg?
teb kom tiav:
Qhov kev kuaj pom muaj nyob hauv roots. Lub metaxylem yog qhov ze tshaj plaws rau qhov chaw nruab nrab ntawm cov hauv paus hniav thiab cov protoxylem yog qhov ze tshaj plaws rau lub periphery. Kev loj hlob Exarch feem ntau pom nyob rau hauv cov hauv paus hniav ntawm cov nroj tsuag vascular.
piv txwv exarch yog dab tsi?
Exarch yog qhov kev npaj uas cov protoxylem tau coj mus rau lub periphery thiab metaxylem mus rau qhov chaw… Endarch kev npaj muaj nyob rau hauv qia ntawm flowering nroj tsuag. Lus Cim: Xylem yog ua los ntawm cov hlwb tuag.
exarch xylem muab piv txwv yog dab tsi?
Exarch yog siv thaum muaj ntau tshaj ib txoj hlua ntawm thawj xylem hauv lub qia lossis hauv paus, thiab xylem tsim tawm sab nraud sab hauv mus rau qhov chaw, piv txwv li centripetally. Cov metaxylem yog li ze tshaj plaws rau qhov nruab nrab ntawm cov qia lossis hauv paus thiab cov protoxylem ze tshaj plaws rau lub periphery.
Vim li cas peb thiaj pom cov xwm txheej hauv cov hauv paus hniav?
Thaum nyob rau hauv qhov xwm txheej, cov protoxylem tsim los ntawm cov hlwb sab nraud thiab nce mus rau sab hauv… mob nyob rau hauv qia uas yog thawj zaug exarch hauv paus.
