一、繁殖的类型 The types of Propagation 二、花的结构 The Structure of Flower 三、被子植物的生殖过程 The Reproduction of Propagation 四、胚胎发育及果实和种子的形成 The Embryonic Development and The Formation of Seed and Fruit 五、被子植物的生活史 The Life History of Angiosperm
1.General feature: (1) contain more cells and less extracellular ground substance (2) Polarisaton: ---free outer surface: face air or other things ---basal surface: face underlying CT, havebasement membrane (3) Avascularity,but innervation: ---no blood vessels ---rich in nerve terminals
---skin is the largest organ of the body, it constitutes about 16% of body weight ---its total surface area is about 1.2-2.2 m2 ---function: protection, sensory reception, excretion and thermoregulation