Dun Aengus. Dun DÃºn aengus is the most famous of several prehistoric forts on The Aran, islands Of. Co. Galway. ireland
The female gametophyteâspecifically termed a megagametophyte âis also called the embryo sac in angiosperms. The megagametophyte produces an egg cell (or several egg cells in some groups) for the purpose of fertilization.he ovary of the gynoecium produces one or more ovules and ultimately becomes the fruit wall. Ovules are attached to the placenta in the ovary through a stalk-like structure known as a funiculus (plural, funiculi). Different patterns of ovule attachment, or placentation, can be found among plant species, these include:
Describe the pine cone in terms of structure and function. The female pine cone is a compact structure formed from a central axis with whorls of sporophylls (scales) attached. The sporophylls are scale-like structures with two ovules at the base of each. The scales are open when the female cone is young in order to accept pollen delivered by the wind. After pollination the scales of the female cone close. The cone develops and enlarges over the next year or two as the pollen tube grows through the micropyle towards the archegonium. After fertilization the female cone becomes even larger and woody. When the seeds are completely developed the pine cone opens up to release the seeds.