Étude de l'appareil végétatif et reproducteur chez les thallophyte _ TP partie 1 de la séance 1

Flower Morphology and Anatomy of Reproductive Organs Objective: To highlight the morphological structure of the hermaphrodite flower and study anatomical sections of the anthers and ovaries. Introduction: Generally, the flower has both a male and a female organ: it is called bisexual or hermaphrodite. Other species are unisexual, containing a gynoecium and no androecium (pistillate flowers sometimes with a rudiment of androecium), others an androecium and no gynoecium (staminate flowers sometimes with a rudiment of gynoecium). There are also sterile flowers—without stamens or carpels—occupying a well-defined position in certain inflorescences. If both male and female flowers are produced on the same individual, the plant is said to be monoecious; If these flowers are produced on different individuals, the plant is called dioecious. The pollination of many plants relies on a collaboration between the pollinator and the plant, a product of coevolution. Following fertilization, the flower transforms into fruit containing seeds. Materials and reagents needed for the experiments: Microscope, binocular microscope, prepared slides of anthers and ovaries, hermaphrodite flower, scalpel, forceps. Intervention  Dissect the flower under a binocular microscope.  Carefully draw and label the flower.  Place the prepared slide of the anther or ovary under a microscope for observation, draw and label the cross-section. At the end of Practical Session 5, the student will be able to identify the different components of the flower and the anatomical structure of its reproductive organs.