Stomata in a spath (Spathiphyllum sp.) leaf epidermis, polarised light micrograph. Stomata are pores that control the rate of gas exchange in the plant. The opening and closing of the stomata are controlled by semi-circular guard cells (sausage-shaped). When the guard cells are turgid the stomata are open and when they are flaccid the stomata are closed. Chloroplasts (small circles) are visible in the lower tissue. Magnification: x93 when printed 10 centimetres wide.

px px dpi = cm x cm = MB
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TOP29293590

Source:

達志影像

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RM

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須由TPG 完整授權

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