LM of the surface of an elder leaf

LM of the surface of an elder leaf

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Caption: Light micrograph of the surface of a leaf of the elder tree, Sambucus nigra. The small oval structures scattered over the surface are stomata (pores), which provide the plant with a means of gaseous exchange between the atmosphere & the internal tissues. The pores are held open during the day & are closed at night to conserve water. Surrounding each stoma are two curved lip-like guard cells which control the opening & closing of the pore. Magnification: x200 at 35mm size.

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Keywords: botany, elder leaf, guard cell, leaf, leaves, light micrograph, nature, plant, plants, sambucus nigra, stomata

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