Pincushion hakea leaf, light micrograph

Pincushion hakea leaf, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Pincushion hakea leaf. Light micrograph of a transverse section through the leaf of a pincushion hakea (Hakea laurina) plant. This is a drought plant (xerophyte). Xerophytes have evolved an anatomy that cuts down water loss through transpiration. The leaf is needle-shaped to reduce the area for water loss. The epidermis consists of thick-walled cells covered in a thick cuticle (light-pink). The stomata (white and yellow) are sunken to trap moist air. The vascular bundles (dense patches, centre) are surrounded by a ring of supportive fibres (green), and inside the fibres are the phloem (oval, light green) and xylem (dark green and red). Magnification: x103 when printed 10 centimetres wide.

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Keywords: adaptation, adaptations, adapted, angiosperm, angiosperms, arid, biological, biology, botanical, botany, bundles, cell, cells, cuticle, drought plant, dry, emu bush, epidermis, fibres, flora, hakea laurina, kodjet, leaf, light micrograph, light microscope, nature, needle shaped, needle-shaped, phloem, pincushion hakea, plant, plants, stem, stoma, stomata, supportive fibre, tissue, vascular bundle, xerophyte, xerophytic, xylem

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