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بنية الورقة

طبقة شمعية تقلل من فقدان الماء الكيوتيكل
خلايا متراصة تقع تحت البشرة العلوية تحدث فيها معظم عملية البناء الضوئي النسيج المتوسط العمادي
تغطي الورقة البشرة الخارجية العليا
تتكون من نسيج الخشب واللحاء الحزمة الوعائية
يتألف من خلايا متباعدة غير منتظمة بينها فراغات النسيج المتوسط الإسفنجي
تحتوي على ثغور أكثر من البشرة العليا البشرة الخارجية السفلى
تتحكم في إغلاق وفتح الثغر الخلايا الحارسة
ثقوب يتم من خلالها تبادل الغازات ويتبخر الماء عبرها من داخل الورقة إلى خارجها الثغر
Created by: mahab



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