Pitted wall of xylem in balsa wood

Pitted wall of xylem in balsa wood

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Caption: False colour scanning electron micrograph of the pitted wall of a tracheary vessel in balsa wood, the secondary xylem of the tree Ochroma lagopus. The tracheary vessels carry water and nutrients from the roots to the leaves. The pores (pits) allow the exchange of substances with adjacent cells. The vessels are made up of chains of elongated, open-ended cells. The wall has two layers, the primary cell wall and a secondary wall composed of cellulose deposited by the cytoplasm during the cell's early development. The pits are apertures in the secondary wall; the pit membrane seen at the bottom of each pit cavity consists of primary wall material. Mag: x550 at 35mm size.

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Keywords: balsa wood, bordered, botany, hardwood, in vessel, nature, ochroma lagopus, pits, plant, plants, scanning electron micrograph, sem, tracheary vessels, vessel

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