SEM of the undersurface of a zinnia leaf

SEM of the undersurface of a zinnia leaf

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY.

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 vein can be seen crossing the spongy mesophyll carrying water & minerals to, & sugar away from, the leaf. Mag: X 150 (35mm). Original is a B/W print B 745/43M

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

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