按照植物发畏和进化水平,将植物分为: 绿藻门,褐藻门 藻类 低等植物 红藻门,轮藻门 (无胚植物)(地衣 孢子植物 (隐花植物) 苔藓植物门 高等植物 裸蕨类 (有胚植物) 蕨类植物楔叶类 石松类 维笞植物门 真蕨类 裸子植物 种子植物 被子植彩∫双子叶植物 (显花植物) 单子叶植物
第六节 植物界 低等植物 （无胚植物） 孢子植物 （隐花植物） 藻类 地衣 按照植物发展和进化水平，将植物分为： 高等植物 （有胚植物） 苔藓植物门 维管植物门 裸蕨类 楔叶类 石松类 真蕨类 蕨类植物 裸子植物 被子植物 种子植物 双子叶植物 （显花植物） 单子叶植物 红藻门，轮藻门 绿藻门，褐藻门
第六节植物界 Characteristics of Plants Characteristics Carotenoids Characteristics of Plants 类胡萝卜素 1 Are multicellular and have cells specialized to lorm tissues and 2: Contain chlorophylls a and b and carotenoids, store reserve food as starch. and have cellulose walls 3. Have gametangia sex organs) with an outer layer of nonreproductive cells, which prevents desiccation of 4. Protect the developing embryo from drying out by providing it with water anumutnents venue emde reproductive structure. 5. Have a life cycle that is described as alternation of generations All plants, members of the Kingdom Plantae, have certain characteristics in common
Characteristics of Plants Carotenoids 类胡萝卜素 第六节 植物界
Characteristics All plants have life cycles with an alternation of sporophyte generations. This life cycle consists diploid sporophyte sporangium stage followed by a haploid gametophyte zygote stage. A trend in the evolution of plants is diploid (2n tert面 zation towards a reduction in haploid (n) the size and independence of the multicellular gametophyte. Fe gametes res example, in the itive group the gametophyte neophyte is free-living and is th (n) most conspicuous stage of the life cycle On the other hand. in the advanced flowering
植物进化的规律: 古生物证据已经说明,植物界的发畏过程是循看由低级至高 级,由简单到复杂,由单细胞到多细胞,从没有分化到有器 官和性的分化,从水生到陆生方向演化
第六节 植物界 植物进化的规律： 古生物证据已经说明，植物界的发展过程是循着由低级至高 级，由简单到复杂，由单细胞到多细胞，从没有分化到有器 官和性的分化，从水生到陆生方向演化
植物的演化 Characteristics LE a first seed plants Cooksonia I first vascular plant Plants arose from an ancestor that was similar to the green algae present today. The first plants were semi-terrestrial, non-vascular non-seed-producing species. Their direct descendants are the mosses of today. Vascular plants evolved about 430 million years ago and invaded the land. The first vascular plants were similar to the ferns of today. More recently, plants with seeds evolved. The gymnosperms, such as the pines, appeared first. They have naked seeds. Later, the owering plants, appeal Mark Page h Help =Print ceru bst a fr
植物的演化