Sunflower leaf, SEM

Sunflower leaf, SEM

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Caption: Sunflower leaf. Coloured scanning electron micrograph (SEM) of the underside of a sunflower leaf (Helianthus annuus). The green and yellow structures are trichomes, which protect the plant against predators and reduce water loss through evaporation. Also seen are pores (slits), called stomata. These are the site of gaseous exchange, or respiration. Carbon dioxide enters the plant for use in photosynthesis, and waste oxygen exits the plants tissues at the stomata. Water vapour also evaporates through the stomata. Magnification: x715 when printed at 10 centimetres tall.

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Keywords: biological, biology, botanical, botany, coloured, false-coloured, gaseous exchange, green, hair, hairs, helianthus annuus, leaf, nature, plant, pore, pores, protection, protective, respiration, scanning electron micrograph, scanning electron microscope, sem, stoma, stomata, sunflower, trichome, trichomes, underside, water loss

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