| 单词 | microsporangium |
| 例句 | Each lobe, called a microsporangium, is filled with pollen. Fundamentals of Biology 2015-01-01T00:00:00Z If it lacked a microsporangium, what type of gamete would not form? Concepts of Biology 2013-04-25T00:00:00Z C, longitudinal section of a spike, with a single macrosporangium at the base; the others, microsporangia, × 3. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses As the microsporangium matures, two pollen sacs merge and an opening forms between them so that the pollen can be released. Fundamentals of Biology 2015-01-01T00:00:00Z Each lobe, called a microsporangium, is filled with pollen. Fundamentals of Biology 2015-01-01T00:00:00Z The microsporophyte has a cluster of cells called a microsporangium, and the megasporophyte has a cluster of cells called a megasporangium. Fundamentals of Biology 2015-01-01T00:00:00Z If it lacked a microsporangium, what type of gamete would not form? Concepts of Biology 2013-04-25T00:00:00Z The androecium has stamens with anthers that contain the microsporangia. Fundamentals of Biology 2015-01-01T00:00:00Z Inside the anthers’ microsporangia, male gametophytes divide by meiosis to generate haploid microspores, which, in turn, undergo mitosis and give rise to pollen grains. Fundamentals of Biology 2015-01-01T00:00:00Z Microspores, or mother cells form inside the microsporangia. Fundamentals of Biology 2015-01-01T00:00:00Z Through meiosis, the microsporangium forms microspores, and the megasporangium forms megaspores. Fundamentals of Biology 2015-01-01T00:00:00Z The microsporangium contains microspore mother cells, which divide by meiosis to produce haploid microspores. Fundamentals of Biology 2015-01-01T00:00:00Z Within the microsporangium, cells known as microsporocytes divide by meiosis to produce four haploid microspores. Fundamentals of Biology 2015-01-01T00:00:00Z The microsporangia, which are usually bi-lobed, are pollen sacs in which the microspores develop into pollen grains. Fundamentals of Biology 2015-01-01T00:00:00Z Upon maturity, the microsporangia burst, releasing the pollen grains from the anther. Fundamentals of Biology 2015-01-01T00:00:00Z Illustration A shows cross section of an anther, which has four lobes each containing a pollen sac, or microsporangium. Fundamentals of Biology 2015-01-01T00:00:00Z |
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