| 词汇 | example_english_pollen-grain |
| 释义 | pollen graincollocation in Englishmeanings of pollenand grainThese words are often used together. Click on the links below to explore the meanings. Or, see other collocations with grain. pollen noun[U] uk /ˈpɒl.ən/ us /ˈpɑː.lən/ a powder, produced by the male part of a flower, that causes the female part of the same type of flower to produce seeds. It is carried by insects or ... See more at pollen grain noun uk /ɡreɪn/ us /ɡreɪn/ a seed or seeds from a plant, especially a plant like a grass such as rice ... See more at grain Examples of pollen grainThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Before being released from the anther, the pollengrain usually becomes desiccated and enters in a phase of stasis. The cytoplasmic channels, present in the outer part of the intine of the mature, dehydrating pollen grain, degenerate and develop into electron-dense inclusions. The apertures are various modifications of the wall of the pollengrain that may involve thinning, ridges and pores. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Meridionosulcate pollen have a furrow that runs along the equator of the pollengrain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is possible to identify a plant species from its pollengrain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Once a pollengrain settles on a compatible pistil, it germinates in response to a sugary fluid secreted by the mature stigma. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One day he watched through a microscope and saw transparent cones emerge from the side of a geranium pollengrain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The infection process mimics a pollengrain growing into an ovary during fertilization. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It was argued that palaeobotanists would be unhappy if the pollen organs were named using the taxonomic name whose type specimen is a pollengrain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Electron microscopy shows that the tapetal cells that surround the developing pollengrain in the anther have a highly active secretory system containing lipophilic globules. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These two cells in addition to the spore wall make up an immature pollengrain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Once the pollengrain lands on the stigma of a receptive flower (or a female cone in gymnosperms), it takes up water and germinates. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Monosulcate pollen has a single furrow that runs along the pole of the pollengrain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The pollen tube passes through the pollengrain wall by way of structures called apertures. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The outer pollen wall, which prevents the pollengrain from shrinking and crushing the genetic material during desiccation, is composed of two layers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Conditions for a viroid to infect its host include wounds on the host or infected pollengrain deposited into an ovule. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It begins when a pollengrain adheres to the stigma of the carpel, the female reproductive structure of a flower. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This folding of the pollengrain prevents water loss until it arrives in a wetter environment. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. At the end of each is a carpel, which may develop into a kernel if fertilized by a pollengrain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Want to learn more? Go to the definition of pollen Go to the definition of grain See other collocations with grain |
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