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الورقة

بنية الورقة

QuestionAnswer
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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