Plant evolution--------Wong Man Sing
Earth the minority life, the scientist which after the disastrous momentous change, like the ice age, the majority life death, remains down are called the child to lose the biology. And is called the living fossil vividly. Animal like panda, plant like metasequoia glyptostroboides and so on.
The fossil specimen is the ancient biological vestige or the remains, for example the dinosaur fossil, the dinosaur egg, the recent snowy mountain discovery mammoth all is. America discovered maximized stone forest. Sub-loses the plant is refers to the ecology plant, the physiological mechanism, the chemical composition, the heredity gene and so on, the retention ancient form characteristic.
Natural heritage the precious rare and precious plant, China has very many nature protection areas, for example Jilin Changbai mountain, Shanxi taibai mountain, Fujian Wuyi mountain, Yunnan Xishuangbanna, Hainan Island Jianfengling, Tibet Motuo, Xinjiang Altay and so on.
These sub-lose the plant is the rare and precious plants, for example the cyathea, the ginkgo biloba, the metasequoia glyptostroboides, the araucaria heterophylla, the cycas revoluts, the taxodiumascendens , the taxodium distichum, the taxus, the pseudolarix amabilis , the sabina squamata, the davidia involucrata, the eucommia ulmoides , the parashorea chinensis Wang Hsie, the rhododendron protistum, the populus euphratica and so on.
Sub-loses is called the gymnosperm which the plant repetition changes comes.
Gymnosperm's characteristic, the seed exposes on the hard fruit axis the order is arranging, does not have the peel, the fruit pulp diaper. Is apart from now to have 300,010,000 years, after carbon period, permian discipline, the mesozoic era permian discipline, the Jurassic Period, the cretaceous period, the cainozoic era tertiary period, the quaternary ice age time, the survivance gets down the gymnosperm to be very few, present gymnosperm including cycadaceae, araucariaceae, pinaceae, taxodiaceae, cupressaceae, podocarpaceae, cephalotaxaceae, ephedraceae, Gnetaceae, Taxaceae , ginkgoaceae and so on. The Jurassic period generation of plant enters the angiosperm by the gymnosperm repetition which the differentiation comes.
The angiosperm characteristic has the obvious flower, the color, bright and beautiful. After the flower falls down, forms the beautiful fruit, has the peel, and has the fruit pulp. Seed in fruit pulp diaper.
Angiosperm including double seed leaf and monocotyledon plant two big kinds. Again divides has the herb, the woody plants, the liana and so on. But these plants, have the obvious cerebral cortex, the pith, trees' stem increase every year thickly, has the annual ring, the leaf vein lattice. Flower's cardinal number is usually 4-5; the seed embryo is 2 seed leaves.
At the present when today science and technology changes with each new day, the humanity the plant after the high tech hybrid produces the new variety. Also or turns the plant seed the outer space seed.
(The outer space seed is refers to the farm crops seed to leave the Earth, rides on the spacecraft, in the outer space movement, in the microgravity, the perfect vacuum, ultra pure, the strong radiation and the great temperature difference space roams through certain time, the seed gene has the hereditary change. After returns to the Earth, cultivates after the ground four after eight generations. Thus obtains the stable high production, precocious, the disease-resistant strong high quality farm crops seed.)
