SEM of undersurface of Zinnia leaf

SEM of undersurface of Zinnia leaf

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Caption: Scanning electron micrograph (coloured green) of the undersurface of a zinnia leaf, Zinnia elegans. A strip of epidermis (right) is removed (left), showing the spongy mesophyll layer below. The epidermis is studded with stomata, tiny pores that regulate gaseous exchange with the atmosphere. The air enters through the pores & circulates rapidly through the irregularly spaced cells of the spongy mesophyll to the palisade mesophyll layer below, where photosynthesis occurs. A trace of a vein can be seen running through the top leaf hair & down the spongy mesophyll. Mag: X25 (35mm). Original is a B/W print B 745/40M.

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Keywords: botany, leaf, leaves, mesophyll, nature, plant, plants, stoma, zinnia elegans

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