Botany
Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of awareness about which humans had anything more than the vaguest of insights. It is impossible to know today just what our Stone Age ancestors knew about plants, but from what we can observe of preindustrial societies that still exist a detailed learning of plants and their properties must be extremely ancient. This is logical. Plants are the basis of the food pyramid for all living things even for other plants. They have always been enormously important to the welfare of people not only for food, but also for clothing, weapons, tools, dyes, medicines, shelter, and a great many other purposes. Tribes living today in the jungles of the Amazon recognize literally hundreds of plants and know many properties of each. To them, botany, as such, has no name and is probably not even recognized as a special branch of knowledgeat all. Unfortunately, the more industrialized we become the farther away we move from direct contact with plants, and the less distinct our knowledge of botany grows. Yet everyone comes unconsciously on an amazing amount of botanical knowledge, and few people will fail to recognize a rose, an apple, or an orchid. When our Neolithic ancestors, living in the Middle East about 10, 000 years ago, discovered that certain grasses could be harvested and their seeds planted for richer yields the next season the first great step in a new association of plants and humans was taken. Grains were discovered and from them flowed the marvel of agriculture: cultivated crops. From then on, humans would increasingly take their living from the controlled production of a few plants, rather than getting a little here and a little there from many varieties that grew wild - and the accumulated knowledge of tens of thousands of years of experience and intimacy with plants in the wild would begin to fade away.
贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(17)附答案
【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练:6(含解析)
【新人教版 必修1】2016届高三英语一轮总复习(佳作诵读+考点锁定+高频考点+课堂双基+课时作业)精品课件《unit 1 Friendship》
高三英语教学反思4
【新人教版 必修2】2016届高三英语一轮总复习(佳作诵读+考点锁定+高频考点+课堂双基+课时作业)精品课件《unit 1 Cultural relics》(96张ppt)
【人教版】2014届高考英语一轮复习指导考点针对练:必修1 unit3《Travel journal》
河南省三门峡市2014高考英语一轮(暑假)基础训练(3)附答案
辽宁省辽阳市2014高考英语单项选择一轮(暑假)训练(15)附答案
河南省三门峡市2014高考英语一轮(暑假)基础训练(5)附答案
【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练:3(含解析)
【北京专用】2014届高考英语一轮复习方案课时作业:选修6 Unit 3 A healthy life
俄军机在黑海坠毁无人生还
辽宁省辽阳市2014高考英语单项选择一轮(暑假)训练(10)附答案
有关官员取消智利强烈地震后的海啸预警
【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第9组(含解析)
四川省大教育联盟2017届高三四市联考第一次诊断性考试英语试卷.
英语美文:信仰的力量
【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练:7(含解析)
河南省三门峡市2014高考英语一轮(暑假)基础训练(2)附答案
【人教版】2014届高考英语一轮复习指导考点针对练:必修1 unit1《Friendship》
【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练:4(含解析)
河南省三门峡市2014高考英语一轮(暑假)基础训练(11)附答案
【北京专用】2014届高考英语一轮复习方案课时作业:选修6 Unit 4 Global warming
【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练:5(含解析)
贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(20)附答案
贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(19)附答案
Last Christmas!威猛乐队主唱乔治迈克尔去世
贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(13)附答案
【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第2组(含解析)
【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第4组(含解析)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |