مدرسة د / أحمد زويل التجريبية للغات
هل تريد التفاعل مع هذه المساهمة؟ كل ما عليك هو إنشاء حساب جديد ببضع خطوات أو تسجيل الدخول للمتابعة.

مدرسة د / أحمد زويل التجريبية للغات

المدرسة الذكية ـــ تعليمى
 
الرئيسيةالبوابةأحدث الصورالتسجيلدخول

 

 reproduction in plants

اذهب الى الأسفل 
كاتب الموضوعرسالة
Mohamed Hamdy




عدد المساهمات : 1
تاريخ التسجيل : 12/04/2010

reproduction in plants Empty
مُساهمةموضوع: reproduction in plants   reproduction in plants I_icon_minitimeالإثنين أبريل 12, 2010 6:19 pm

Plant reproduction is the process by which plants generate new individuals, or offspring. Reproduction is either sexual or asexual. Sexual reproduction is the formation of offspring by the fusion of gametes . Asexual reproduction is the formation of offspring without the fusion of gametes. Sexual reproduction results in offspring genetically different from the parents.
Asexual offspring are genetically identical except for mutation. In higher plants, offspring are packaged in a protective seed, which can be long lived and can disperse the offspring some distance from the parents. In flowering plants (angiosperms), the seed itself is contained inside a fruit, which may protect the developing seeds and aid in their dispersal.

Plants can reproduce asexually or sexually:

To reproduce asexually, plants use rhizoids, fragmentation, or budding. Strawberries, crab grass, and Bermuda grass are examples of plants that reproduce with rhizoids. The creeping Charlie is an example of a plant that reproduces through fragmentation. The banana is an example of a plant that reproduces through budding.

Sexual reproduction in plants involves male and female plant organs. The female structures invovled in sexual reproduction are the stigma, the style and the ovary. The stigma is the sticky portion of the pistil that captures pollen. The style is long and slender and supports the stigma. The ovary is composed of one or more ovules and is responsible for housing the eggs. The male structures involved in sexual reproduction are the filament and the anther. The filament supports the anther which is responsible for storing and producing pollen. Pollination is the transfer of pollen from an anther to a stigma. Wind, water, insects, birds, and small mammals all aid in the pollination of plants.
الرجوع الى أعلى الصفحة اذهب الى الأسفل
 
reproduction in plants
الرجوع الى أعلى الصفحة 
صفحة 1 من اصل 1

صلاحيات هذا المنتدى:لاتستطيع الرد على المواضيع في هذا المنتدى
مدرسة د / أحمد زويل التجريبية للغات :: قسم المنتديات العامه :: المرحلة الاعدادية :: الصف الثانى :: الفصل الدراسى الثانى :: العلوم-
انتقل الى: