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الخلايا والأنسجة

TermDefinition
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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