| 词汇 | megasporangium |
| 释义 | BETA Examples of megasporangiummegasporangium isn’t in the Cambridge Dictionary yet. You can help! The enclosure of the megasporangium in the integument would additionally not only provide protection against herbivory, it would provide protection against desiccation as well. Fig. 3o) there is a tear-drop shaped scar along most of the pedicel, which is assumed to be the attachment scar of the megasporangium. It has partially developed vessels as found in the angiosperms, and the megasporangium is covered by three envelopes, like the ovary structure of angiosperm flowers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The remnants of the megasporangium tissue (the nucellus) surround the megagametophyte. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is structurally and functionally equivalent to the megasporangium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The ovule initially consists of a stalked, integumented "megasporangium". From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Megaspores develop within the megasporangium; typically one of the four spores produced by meiosis gains bulk at the expense of the remaining three, which disappear. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In these the microgametophyte is reduced to pollen and the megagametophyte remains inside the megasporangium, attached to the parent plant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The megasporangium bears an unopened distal extension protruding above the multilobed integument. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The megasporangium bears an unopened distal extension protruding above the mutlilobed integument. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The megasporangium has a multilobed integument, and there is an extension on the megasporangium that suggests an adaptation to wind pollination. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This might, through fusion between lobes and between the structure and the megasporangium, have produced an integument. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One kind, the megasporangium, produces only a single large spore (a megaspore). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The megagametophyte develops within the megaspore of extant seedless vascular plants and within the megasporangium in a cone or flower in seed plants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A megasporangium invested in protective layer called an integument is known as an ovule. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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