| 单词 | megasporangium |
| 例句 | The ovule, sheltered within the ovary of the carpel, contains the megasporangium protected by two layers of integuments and the ovary wall. Fundamentals of Biology 2015-01-01T00:00:00Z If a flower lacked a megasporangium, what type of gamete would it not be able to form? Concepts of Biology 2013-04-25T00:00:00Z Through meiosis, the microsporangium forms microspores, and the megasporangium forms megaspores. Fundamentals of Biology 2015-01-01T00:00:00Z A double-layered integument protects the megasporangium and, later, the embryo sac. Fundamentals of Biology 2015-01-01T00:00:00Z The integuments, while protecting the megasporangium, do not enclose it completely, but leave an opening called the micropyle. 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 The layer of sporophyte tissue that surrounds the megasporangium, and later, the embryo, is called the integument. Fundamentals of Biology 2015-01-01T00:00:00Z The megasporangium contains megaspore mother cells, which divide by meiosis to produce haploid megaspores. Fundamentals of Biology 2015-01-01T00:00:00Z In the female cone, megaspore mother cells are present in the megasporangium. Fundamentals of Biology 2015-01-01T00:00:00Z First, in the process of megasporogenesis, a single cell in the diploid megasporangium—an area of tissue in the ovules—undergoes meiosis to produce four megaspores, only one of which survives. Fundamentals of Biology 2015-01-01T00:00:00Z |
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