In flowering plants, the megagametophyte (also referred to as the embryo sac) is much smaller and typically consists of only seven cells and eight nuclei. This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.t consists of three parts: The integument(s) forming its outer layer(s), the nucellus (or remnant of the megasporangium), and female gametophyte (formed from haploid megaspore) in its center. The female gametophyteâspecifically termed a megagametophyte âis also called the embryo sac in angiosperms.
Late winter or early spring is the best time to begin spraying an apple tree. Using horticultural oil spray helps to destroy any insects and their eggs on the tree before new growth begins.
Collect two different kinds of seeds. Apple trees must be planted in pairs in order to bear fruit--apple trees are not self-pollinating, so they need a different kind of apple tree to pollinate with. You can either extract the seeds from an apple you are eating, or buy apple seeds at the store. The soil should be moderately rich and have a relatively neutral pH level. 2  Space: Because you are growing your tree from seed, it will grow to full size (meaning it can reach 20-30 feet/6-9 meters in height).