Leaf structure of Zinnia plant

Leaf structure of Zinnia plant

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Credit: DR. JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph of a cross fracture through a leaf of the plant Zinnia elegans, showing its internal structure. The upper epidermis at top of picture consists of two layers of palisade mesophyll cells, within which are contained many chloroplasts (photosynthesis). Beneath is the spongy mesophyll layer which contains few chloroplasts but many air spaces. This layer lies above the lower epidermis where the stomata (pores in the leaf surface) are found. The stomata enable gaseous exchange to take place between the interior of the leaf and the atmosphere, hence the airy nature of this section. Magnification: x135 at 35mm size.

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Keywords: botany, cells, chloroplast, leaf, leaves, mesophyll, nature, palisade cell, photosynthesis, plant, plants, scanning electron micrograph, sem, stomata, zinnia elegans

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