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Utomvu ni kiowevu kinachopitishwa katika seli za mimea. Unasafirisha maji na lishe ndani ya mmea[1].
Kutokana na aina mbili tofauti za seli za mimea, yaani zilemu na floemu, kuna aina mbili za utomvu wa zilemu na utomvu wa floemu[2].
- ↑ Sap (plant physiology), tovuti ya Encyclopedia Britannica online
- ↑ PLANTS AND THEIR STRUCTURE Ilihifadhiwa 22 Oktoba 2006 kwenye Wayback Machine., On-Line Biology Book, 2001