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الخلايا والأنسجة

البشرة طبقة من الخلايا تكون الغطاء الخارجي للنبات
الكيوتيكل مادة دهنية تفرزها خلايا البشرة تقلل من فقدان الماء وتمنع دخول مسببات المرض
الثغور فتحات صغيرة في معظم الاوراق والسيقان الخضراء
وظيفة الثغر يدخل من خلالها ثاني أكسيد الكربون والماء والأكسجين وأخرى
الخليتان اللتان تشكلان الثغر وتتحكمان في فتحه وإغلاقه
الخليتان الحارستان الخليتان اللتان تشكلان الثغر وتتحكمان في فتحه وإغلاقه
الشعيرات نتوءات صغيرة تنتجها بعض خلايا البشرة على الاوراق والسيقان
وظيفة الشعيرات على الساق حماية النبات من المفترسات والحشرات تحافظ على النبات بارد؟ لأنها تعكس اشعة الشمس
الشعيرات الجذرية امتدادات هشة تخرج من بشرة بعض الجذور
وظيفة الشعيرات تزيد من فعالية امتصاص الجذر للماء والأملاح
Created by: akittaneh82



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