兰花的智慧 阅读答案（The wisdom of orchids, reading answers）.docVIP

兰花的智慧 阅读答案（The wisdom of orchids, reading answers） Orchid wisdom From tropical rain forests to boreal forests, from wet beaches to dry alpine meadows, patches of orchids can be found everywhere. They traveled all over the world, not only has a beautiful appearance, and the full of craft and cunning means of subsistence. Orchid fruit is not large, but the small fruit pod was hidden in Jiwanshijiwan even millions of seeds. These seeds are as fine as dust and are usually 0.05-0.06 millimeters in width, and are 0.01-0.9 millimeters in width. Many are thinner than human hair (0.08 millimeters). Inside the testa of the seed, there are many air filled chambers that further reduce the weight. With a light body, a seed pod can take advantage of this trip free bus to drift far away from the plant. In order to resist the harsh environment, the seeds of the periphery of the baby has a dense layer of cells, which can prevent the rapid infiltration of water. In this way, from the wind bus down, the seeds can also use the flow of water, animal fur go farther afield. But in the process of setting is to adopt a strategy from flowering to throw the helve after the hatchet - all or nothing. It packs pollen into clumps - not giving pollinators a chance to eat. Pollinium caudicle with viscidium, together form the male reproductive structure of orchid plants, the whole structure will stick in pollinator body through their transfer to a flower stigma, thus avoiding the waste caused by feeding. And all the pollen gathered into the pollen block, or pollinators will take all the pollen, otherwise, the pollen block can not reach the stigma, all wasted, resulting in one hundred percent of the male waste of resources. Although pollen is not available, some orchids provide pollinators with benefits such as nectar or wax. However, there are 1/3 members of the orchid family is hundred-percent stingy, in the enjoyment of pollination services at the same time do not give any good pollinators. They d