线索词为教授所说:Pollen and starch grains,for example,have been used in archaeological studies,as have what are called “phytoliths.”本篇讲座主要讲解phytoliths(植物岩)在科学研究中的运用。A选项错误,因为花粉与植物岩这两种分析法的对比仅为细节内容。本篇讲座并未全文对比。B选项属原文未提及。文中...
可知,污染的空气使它们不能很好地闻到花的气味,难以找到食物,答案为 The polluted air prevents them from smelling flowers well and finding their food.结合语境 “The results were much more severe than we thought” 以及后文提到受污染区域昆虫进入数量减少、访花次数大幅下降等情况,可知 “severe” 意思是 ...
What is cross-pollination? How does the stamen release sperm in pollen? What occurs after fertilization in a flowering plant? What is the difference between pollination and fertilization? Is pollen produced by the stamen? What is the fate of the stamen after fertilization?
Pollen is a powdery substance that is released by certain plants and trees, especially flowers that helps them reproduce.
12.What is the main purpose of this passage? A.To explain the concept of symbiosis by expanded descriptions of its principal types B.To make a comparison between human relationships and symbiotic interactions in the natural world C.To demonstrate the unforeseen benefits of natural processes that ...
What is the function of pollen grains in flowers? View Solution ___ produces pollen grains in a flower. View Solution Study the diagram given below How many male gametes are produced by each pollen grain? View Solution The ploidy of a gamete present in the pollen grain is View...
But the one reason for tree loss that humans can control is sensible development. F. Nowak says there is a downside to trees too, such as pollen allergy (花粉过敏) or large tailing branches in storms, and people don’t like sweeping leaves. But, he says, there are ways cities and ...
fruits C. pollen D. colour3. The underlined word “predators” in Paragraph refers to animals which B A. hide in secret places B. kill other animals for food C. change colour with the sun D. protect themselves from danger4. What is the main purpose of the passage? A. To describe ...
Explore the different methods of pollination. Learn the definition of pollination and how pollen is transferred. Explore the various types of pollination. Related to this Question What is the main purpose of flowers? Why do flowering plants have petals?
the most important traditional Navajo rituals include the production of large floor paintings.These are actually made by pouring thin, finely controlled streams of colored sands or pulverized vegetable and mineral substances, pollen, and flowers inprecisepatterns on the ground.The largest of these paint...